{"title":"Storage \u0026 Organization","description":"","products":[{"product_id":"gratnells-callero-tall-pick-store-adder-unit-21-deep-sunshine-yellow-trays","title":"Gratnells Callero Tall Pick Store Adder Unit with 21 Deep Sunshine Yellow Trays","description":"\u003cp\u003eThe Gratnells Callero Tall Pick Store Adder Unit is a modular classroom storage solution designed to expand existing Callero Custom systems. Featuring 21 deep Sunshine Yellow trays within a durable silver steel frame, it provides high-capacity organization while maintaining a compact footprint. Ideal for STEM classrooms, makerspaces, libraries, and innovation labs, it helps keep learning materials accessible, organized, and ready for daily instruction.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eSchools and educational organizations rely on the Callero system to create flexible storage that grows alongside changing classroom needs. The modular design supports organized resource management while encouraging student independence through safe, easy-access trays that simplify classroom routines.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eModular adder unit expands existing Callero Custom storage systems.\u003c\/li\u003e\n\u003cli\u003eIncludes 21 deep antimicrobial Sunshine Yellow trays for high-capacity storage.\u003c\/li\u003e\n\u003cli\u003eCompact footprint maximizes storage without reducing valuable classroom space.\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being fully removed for added safety.\u003c\/li\u003e\n\u003cli\u003eHeavy-duty steel frame supports up to 250 kg of distributed load.\u003c\/li\u003e\n\u003cli\u003eSmooth, rounded frame design provides a safer environment for students.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eOrganize robotics, engineering, and STEM project materials.\u003c\/li\u003e\n\u003cli\u003eStore classroom supplies by subject, group, or activity.\u003c\/li\u003e\n\u003cli\u003eCreate expandable makerspace or resource center storage systems.\u003c\/li\u003e\n\u003cli\u003eSupport independent student access to learning materials.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48600510169337,"sku":"CADD010744020202","price":2759.83,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CADD010744020202_-_Callero_Custom_Tall_Pick-Store_Adder_Unit_9_Tilting_Deep_12_Deep_Sunshine_Yellow_Trays.avif?v=1782554152"},{"product_id":"gratnells-callero-custom-low-level-9-deep-tilting-tray-adder-unit-sunshine-yellow","title":"Gratnells Callero Custom Low Level 9 Deep Tilting Tray Adder Unit – Silver Frame with Sunshine Yellow Trays","description":"\u003cp\u003eThe Gratnells Callero Custom Low Level 9 Deep Tilting Tray Adder Unit is a modular classroom storage solution designed to maximize organization while using minimal floor space. Featuring nine deep tilting trays in Sunshine Yellow, this low-profile unit keeps STEM materials, classroom supplies, and learning resources easily accessible for both teachers and students. Its expandable design allows schools to build flexible storage systems that grow alongside changing classroom needs.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eIdeal for STEM classrooms, makerspaces, libraries, and collaborative learning environments, this storage unit helps create organized, efficient learning spaces. The tilting tray design provides quick visibility and easy access to frequently used materials while supporting student independence and maintaining a safe classroom environment.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eIncludes 9 deep tilting Gratnells trays in Sunshine Yellow for organized material storage.\u003c\/li\u003e\n  \u003cli\u003eModular adder frame expands existing Callero Custom storage systems.\u003c\/li\u003e\n  \u003cli\u003eCompact footprint provides high-capacity storage without taking up valuable classroom space.\u003c\/li\u003e\n  \u003cli\u003eSteel frame supports up to 250 kg with trays rated for up to 5 kg each.\u003c\/li\u003e\n  \u003cli\u003eStopSafe runners help prevent trays from being fully removed, improving classroom safety.\u003c\/li\u003e\n  \u003cli\u003eRounded frame design minimizes sharp edges for child-friendly learning environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eOrganize robotics, engineering, and STEM project materials.\u003c\/li\u003e\n  \u003cli\u003eStore classroom manipulatives, science equipment, and art supplies.\u003c\/li\u003e\n  \u003cli\u003eCreate accessible resource stations for collaborative learning.\u003c\/li\u003e\n  \u003cli\u003eExpand modular storage systems as classroom programs grow.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48600691507449,"sku":"CADD0144020202","price":1160.97,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CADD0144020202_-_Callero_Custom_Low_Tilted_Tray_Adder_Unit_9_Deep_Sunshine_Yellow_Trays.avif?v=1782562183"},{"product_id":"gratnells-callero-tall-display-store-adder-unit-12-deep-trays-sunshine-yellow","title":"Gratnells Callero Tall Display Store Adder Unit with 12 Deep Trays – Sunshine Yellow","description":"\u003cp\u003eThe Gratnells Callero Tall Display Store Adder Unit is a modular classroom storage solution designed to expand existing Callero Custom storage systems. Featuring 12 deep Sunshine Yellow trays, it combines high-capacity organization with open display shelving to keep STEM materials, classroom resources, and student projects accessible and neatly organized while maximizing floor space.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eSchools, makerspaces, libraries, and STEM learning environments benefit from flexible storage that grows alongside their programs. This tall adder unit helps educators organize supplies, showcase learning materials, and create efficient classroom layouts while maintaining a safe, student-friendly environment.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eModular adder unit designed to extend Callero Custom storage systems.\u003c\/li\u003e\n  \u003cli\u003eIncludes 12 deep Sunshine Yellow trays for organizing classroom materials and equipment.\u003c\/li\u003e\n  \u003cli\u003eTall, space-efficient design provides generous storage without increasing floor footprint.\u003c\/li\u003e\n  \u003cli\u003eIntegrated display shelving supports books, learning resources, and student projects.\u003c\/li\u003e\n  \u003cli\u003eSteel frame with rounded edges promotes durability and classroom safety.\u003c\/li\u003e\n  \u003cli\u003eStopSafe runners help prevent trays from being accidentally removed during everyday use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eOrganize robotics, engineering, and STEM project supplies.\u003c\/li\u003e\n  \u003cli\u003eDisplay curriculum resources, models, and student work.\u003c\/li\u003e\n  \u003cli\u003eCreate expandable storage walls for classrooms, libraries, and makerspaces.\u003c\/li\u003e\n  \u003cli\u003eStore frequently used teaching materials for quick daily access.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48600716214521,"sku":"CADD070644020202","price":2483.72,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CADD070644020202_-_Callero_Custom_Tall_Display-Store_Adder_Unit_3_Flat_Shelves_12_Deep_Sunshine_Yellow_Trays.avif?v=1782562692"},{"product_id":"gratnells-callero-custom-tall-high-store-adder-unit-24-deep-trays-sunshine-yellow","title":"Gratnells Callero Custom Tall High-Store Adder Unit with 24 Deep Trays – Sunshine Yellow","description":"\u003cp\u003eThe Gratnells Callero Custom Tall High-Store Adder Unit is a modular classroom storage solution designed to maximize organization while using minimal floor space. Featuring 24 deep trays and a durable steel frame, it helps educators keep STEM materials, classroom supplies, and project resources accessible, secure, and neatly organized. As an adder unit, it connects to an existing Callero Custom starter frame to expand storage capacity as learning environments grow.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eFlexible storage is essential in STEM classrooms where equipment, consumables, and student projects need to remain organized and easy to access. This high-capacity unit supports efficient classroom management while creating a safer, more organized learning environment that encourages student independence and resource sharing.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eModular adder unit expands an existing Callero Custom storage system.\u003c\/li\u003e\n  \u003cli\u003eIncludes 24 deep trays for high-capacity classroom organization.\u003c\/li\u003e\n  \u003cli\u003eCompact footprint provides maximum storage without taking up valuable learning space.\u003c\/li\u003e\n  \u003cli\u003eStopSafe runners help prevent trays from being pulled out too far for added classroom safety.\u003c\/li\u003e\n  \u003cli\u003eDurable steel frame supports up to 250 kg with trays rated for up to 5 kg each.\u003c\/li\u003e\n  \u003cli\u003eRounded frame design minimizes sharp edges for child-friendly learning environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eOrganize robotics, engineering, and STEM classroom materials.\u003c\/li\u003e\n  \u003cli\u003eStore science lab equipment and project supplies.\u003c\/li\u003e\n  \u003cli\u003eCreate expandable makerspace and innovation lab storage systems.\u003c\/li\u003e\n  \u003cli\u003eManage shared classroom resources in libraries and collaborative learning spaces.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48600808030457,"sku":"CADD070744020202","price":3138.97,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CADD070744020202_-_Callero_Custom_Tall_High-Store_Adder_Unit_24_Deep_Sunshine_Yellow_Trays.avif?v=1782563266"},{"product_id":"gratnells-callero-custom-low-level-12-deep-tray-adder-unit-sunshine-yellow","title":"Gratnells Callero Custom Low Level 12 Deep Tray Adder Unit – Silver Frame with Sunshine Yellow Trays","description":"\u003cp\u003eThe Gratnells Callero Custom Low Level 12 Deep Tray Adder Unit is a modular classroom storage solution designed to expand existing Callero Custom configurations. Featuring a durable steel frame and 12 deep Sunshine Yellow trays, it provides organized, space-efficient storage for STEM materials, classroom resources, and maker supplies. Its compact footprint helps maximize valuable learning space while keeping frequently used materials easily accessible.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eSchools, makerspaces, libraries, and STEM learning environments rely on flexible storage that grows alongside evolving classroom needs. This adder unit allows educators to create customized storage systems that improve organization, encourage student independence, and keep instructional materials readily available for hands-on learning.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eExpandable low-level adder unit designed for Callero Custom storage systems.\u003c\/li\u003e\n\u003cli\u003eIncludes 12 durable deep trays in Sunshine Yellow for high-capacity organization.\u003c\/li\u003e\n\u003cli\u003eCompact 16.9-inch depth maximizes storage while conserving classroom floor space.\u003c\/li\u003e\n\u003cli\u003eHeavy-duty steel frame supports up to 250 kg with trays rated for 5 kg each.\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being pulled out too far for added classroom safety.\u003c\/li\u003e\n\u003cli\u003eSmooth, rounded frame design minimizes sharp edges for child-friendly learning environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eStore robotics kits, engineering materials, and STEM project components.\u003c\/li\u003e\n\u003cli\u003eOrganize classroom supplies by subject, grade level, or activity.\u003c\/li\u003e\n\u003cli\u003eCreate modular maker and innovation spaces with expandable storage.\u003c\/li\u003e\n\u003cli\u003eProvide accessible resource stations that encourage independent student use.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48601625067769,"sku":"CADD0744020202","price":1517.92,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CADD0744020202_-_Callero_Custom_Low_Treble_Adder_Unit_12_Deep_Sunshine_Yellow_Trays.avif?v=1782578121"},{"product_id":"gratnells-callero-custom-low-level-8-deep-tray-adder-unit-sunshine-yellow","title":"Gratnells Callero Custom Low Level 8 Deep Tray Adder Unit – Silver Frame with Sunshine Yellow Trays","description":"\u003cp\u003eThe Gratnells Callero Custom Low Level 8 Deep Tray Adder Unit provides compact, high-capacity classroom storage designed for modern learning environments. Built around the trusted Gratnells tray system, this modular unit helps educators organize STEM materials, classroom resources, and maker supplies while maximizing valuable floor space.\u003c\/p\u003e\n\n\u003cp\u003eDesigned as part of the expandable Callero Custom range, this low-profile adder unit integrates seamlessly with compatible starter frames to create flexible storage layouts that can grow alongside classroom needs.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eSchools, STEM labs, libraries, and makerspaces rely on organized storage to keep learning materials accessible and protected. The low-level design supports student independence, while the modular system allows educators to build customized storage solutions for changing classroom layouts and instructional needs.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eIncludes 8 deep Sunshine Yellow storage trays for larger classroom materials and supplies.\u003c\/li\u003e\n  \u003cli\u003eExpandable adder unit integrates with Gratnells Callero Custom storage systems.\u003c\/li\u003e\n  \u003cli\u003eCompact low-level footprint provides high-capacity storage without occupying excessive classroom space.\u003c\/li\u003e\n  \u003cli\u003eDurable steel frame supports up to 250 kg with antimicrobial polypropylene trays rated for 5 kg each.\u003c\/li\u003e\n  \u003cli\u003eStopSafe runners help prevent trays from being fully removed for improved classroom safety.\u003c\/li\u003e\n  \u003cli\u003eRounded frame design eliminates sharp edges for child-friendly learning environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eOrganize STEM kits, robotics parts, and engineering materials.\u003c\/li\u003e\n  \u003cli\u003eStore science lab equipment and classroom supplies within easy student reach.\u003c\/li\u003e\n  \u003cli\u003eCreate flexible storage walls in makerspaces, libraries, and innovation labs.\u003c\/li\u003e\n  \u003cli\u003eSupport collaborative classrooms with accessible shared learning resources.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48601682051321,"sku":"CADD13440202","price":1222.55,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CADD13440202_-_Callero_Custom_Low_Double_Adder_Unit_8_Deep_Sunshine_Yellow_Trays.avif?v=1782578838"},{"product_id":"gratnells-callero-custom-low-level-6-deep-tray-library-adder-unit-sunshine-yellow","title":"Gratnells Callero Custom Low Level 6 Deep Tray Library Adder Unit – Silver Frame with Sunshine Yellow Trays","description":"\u003cp\u003eThe Gratnells Callero Custom Low Level 6 Deep Tray Library Adder Unit is a modular classroom storage solution designed to expand existing Callero Custom storage systems. Featuring six deep trays in Sunshine Yellow and a durable silver steel frame, it provides organized, high-density storage while maintaining a compact footprint that fits comfortably into modern learning environments.\u003c\/p\u003e\n\n\u003cp\u003eIdeal for libraries, STEM labs, makerspaces, classrooms, and resource centers, this low-profile unit keeps books, learning materials, equipment, and classroom supplies easily accessible. Its child-friendly design, antimicrobial trays, and StopSafe runners help create a safer, more organized learning space that supports everyday classroom activities.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eSchools and educators rely on modular storage that can adapt as learning spaces evolve. This adder unit extends existing Callero Custom configurations, making it easy to create flexible storage systems for STEM resources, library collections, classroom supplies, and collaborative learning environments while maximizing available floor space.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eIncludes six deep Gratnells trays in Sunshine Yellow for high-capacity storage.\u003c\/li\u003e\n  \u003cli\u003eExpands compatible Callero Custom modular storage systems.\u003c\/li\u003e\n  \u003cli\u003eCompact low-level design fits beneath displays, windows, and collaborative workspaces.\u003c\/li\u003e\n  \u003cli\u003eHeavy-duty steel frame supports up to 250 kg with trays rated for 5 kg each.\u003c\/li\u003e\n  \u003cli\u003eStopSafe runners help prevent trays from being accidentally removed.\u003c\/li\u003e\n  \u003cli\u003eSmooth, rounded frame design improves safety in student learning environments.\u003c\/li\u003e\n  \u003cli\u003eAntimicrobial polypropylene trays are durable, easy to clean, and built for daily classroom use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eOrganize STEM kits, robotics components, and engineering materials.\u003c\/li\u003e\n  \u003cli\u003eStore library books, reading resources, and literacy supplies.\u003c\/li\u003e\n  \u003cli\u003eCreate flexible storage for makerspaces and innovation labs.\u003c\/li\u003e\n  \u003cli\u003eKeep classroom manipulatives, art supplies, and teaching materials neatly organized.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48601719931129,"sku":"CADD1644020202","price":1357.69,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CADD1644020202_-_Callero_Custom_Low_Library_Adder_Unit_6_Deep_Sunshine_Yellow_Trays.avif?v=1782579341"},{"product_id":"gratnells-callero-custom-tall-slim-store-adder-unit-24-tray-sunshine-yellow","title":"Gratnells Callero Custom Tall Slim Store Adder Unit with 24 Trays – Silver Frame \u0026 Sunshine Yellow Trays","description":"\u003cp\u003eThe Gratnells Callero Custom Tall Slim Store Adder Unit expands existing Callero storage systems with high-capacity organization in a compact footprint. Featuring 16 shallow and 8 deep trays, this modular storage frame helps educators keep classroom materials, STEM supplies, and learning resources organized, accessible, and ready for everyday use.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eDesigned for schools, makerspaces, libraries, and STEM classrooms, this tall adder unit maximizes vertical storage without taking up valuable floor space. Its modular design allows institutions to build customized storage walls that grow alongside changing classroom needs while supporting safe, organized learning environments.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eIncludes 16 shallow and 8 deep removable Gratnells trays for versatile storage.\u003c\/li\u003e\n\u003cli\u003eCompact tall frame provides high-capacity storage in a space-saving footprint.\u003c\/li\u003e\n\u003cli\u003eModular adder unit connects seamlessly with compatible Callero Custom starter units.\u003c\/li\u003e\n\u003cli\u003eSteel frame supports up to 250 kg with trays rated for up to 5 kg each.\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being fully removed for added classroom safety.\u003c\/li\u003e\n\u003cli\u003eRounded frame design minimizes sharp edges, making it suitable for student learning spaces.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eOrganize robotics, engineering, and STEM project materials.\u003c\/li\u003e\n\u003cli\u003eStore classroom manipulatives, art supplies, and science equipment.\u003c\/li\u003e\n\u003cli\u003eCreate modular resource walls in makerspaces and school libraries.\u003c\/li\u003e\n\u003cli\u003eSupport classroom organization with clearly separated learning materials.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48601789104377,"sku":"CADD1818440202","price":2835.84,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CADD1818440202_-_Callero_Custom_Tall_Slim-Store_Adder_Unit_16_Shallow_8_Deep_Sunshine_Yellow_Trays.avif?v=1782579888"},{"product_id":"gratnells-callero-custom-low-level-8-shallow-4-deep-tray-adder-unit-sunshine-yellow","title":"Gratnells Callero Custom Low-Level 8 Shallow \u0026 4 Deep Tray Adder Storage Unit – Silver Frame with Sunshine Yellow Trays","description":"\u003cp\u003eThe Gratnells Callero Custom Low-Level 8 Shallow \u0026amp; 4 Deep Tray Adder Unit expands existing Callero storage systems with flexible, high-density organization for classrooms, makerspaces, and STEM labs. Its compact footprint provides generous storage while keeping learning materials accessible, organized, and ready for everyday instruction.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eDesigned for busy educational environments, this modular storage unit helps schools organize classroom resources, STEM equipment, robotics components, art supplies, and teaching materials without sacrificing valuable floor space. The combination of shallow and deep trays supports efficient organization for supplies of varying sizes while promoting independent student access.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eIncludes 8 shallow trays and 4 deep trays for versatile classroom storage.\u003c\/li\u003e\n\u003cli\u003eLow-profile modular adder unit expands existing Callero Custom storage systems.\u003c\/li\u003e\n\u003cli\u003eCompact 16.9-inch depth maximizes storage while minimizing floor space.\u003c\/li\u003e\n\u003cli\u003eDurable steel frame with antimicrobial polypropylene trays designed for daily educational use.\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being fully removed, improving classroom safety.\u003c\/li\u003e\n\u003cli\u003eSmooth, rounded frame design minimizes sharp edges in student learning environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eOrganize robotics, engineering, and STEM project materials.\u003c\/li\u003e\n\u003cli\u003eStore science lab supplies and classroom equipment.\u003c\/li\u003e\n\u003cli\u003eCreate accessible makerspace storage for shared learning resources.\u003c\/li\u003e\n\u003cli\u003eKeep art, math, and literacy materials neatly organized by activity or grade level.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48601826492665,"sku":"CADD18440202","price":1273.97,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CADD18440202_-_Callero_Custom_Low_Double_Adder_Unit_8_Shallow_4_Deep_Sunshine_Yellow_Trays.avif?v=1782580414"},{"product_id":"gratnells-callero-custom-low-level-16-shallow-4-deep-tray-adder-unit-sunshine-yellow","title":"Gratnells Callero Custom Low-Level 16 Shallow \u0026 4 Deep Tray Adder Unit – Sunshine Yellow Trays","description":"\u003cp\u003eThe Gratnells Callero Custom Low-Level 16 Shallow \u0026amp; 4 Deep Tray Adder Unit is a modular classroom storage solution designed to maximize organization while minimizing floor space. Featuring 20 removable trays in a compact, low-profile frame, it helps educators keep STEM materials, classroom supplies, and learning resources neatly organized and easily accessible. Its expandable design makes it ideal for schools creating flexible and scalable learning environments.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eBuilt for busy classrooms, makerspaces, libraries, and STEM labs, this storage unit supports efficient resource management while encouraging student independence. The modular Callero system grows alongside classroom needs, making it an excellent long-term storage solution for educational environments.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eIncludes 16 shallow trays and 4 deep trays for flexible storage of classroom materials.\u003c\/li\u003e\n\u003cli\u003eModular adder unit connects with existing Callero Custom frames to expand storage capacity.\u003c\/li\u003e\n\u003cli\u003eCompact low-profile design fits beneath displays, along walls, or in collaborative learning spaces.\u003c\/li\u003e\n\u003cli\u003eSteel frame supports up to 250 kg while each tray holds up to 5 kg.\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being pulled out too far, improving classroom safety.\u003c\/li\u003e\n\u003cli\u003eSmooth, rounded frame design minimizes sharp edges for child-friendly learning environments.\u003c\/li\u003e\n\u003cli\u003eDurable steel frame with polypropylene trays designed for everyday educational use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eOrganize STEM kits, robotics components, and engineering materials.\u003c\/li\u003e\n\u003cli\u003eStore classroom supplies for science labs, makerspaces, and innovation centers.\u003c\/li\u003e\n\u003cli\u003eCreate accessible resource stations that promote independent student learning.\u003c\/li\u003e\n\u003cli\u003eExpand existing classroom storage systems as educational programs grow.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48601865093369,"sku":"CADD2144020202","price":1606.3,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CADD2144020202_-_Callero_Custom_Low_Treble_Adder_Unit_16_Shallow_4_Deep_Sunshine_Yellow_Trays.avif?v=1782580988"},{"product_id":"gratnells-callero-tall-flexi-store-adder-unit-16-shallow-8-deep-4-jumbo-sunshine-yellow","title":"Gratnells Callero Custom Tall Flexi Store Adder Unit with 16 Shallow, 8 Deep \u0026 4 Jumbo Trays – Sunshine Yellow","description":"\u003cp\u003eThe Gratnells Callero Custom Tall Flexi Store Adder Unit provides flexible, high-capacity classroom storage for STEM learning environments, makerspaces, libraries, and resource rooms. Featuring a combination of shallow, deep, and jumbo trays, it helps educators organize everything from small components to larger classroom materials while maximizing vertical storage space. Its modular design allows schools to expand storage systems as classroom needs evolve.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eDesigned for busy educational environments, this storage unit supports organized, efficient learning by keeping teaching materials visible, accessible, and easy to manage. The mixed tray configuration is ideal for STEM classrooms where supplies range from small electronics and engineering parts to larger science equipment and project materials.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eIncludes 16 shallow, 8 deep, and 4 jumbo trays for versatile classroom organization.\u003c\/li\u003e\n\u003cli\u003eTall modular adder unit expands existing Callero Custom storage systems.\u003c\/li\u003e\n\u003cli\u003eCompact footprint maximizes storage while conserving valuable classroom space.\u003c\/li\u003e\n\u003cli\u003eDurable steel frame with antimicrobial polypropylene trays built for everyday school use.\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being pulled out too far, improving classroom safety.\u003c\/li\u003e\n\u003cli\u003eSupports up to 250 kg frame capacity with trays rated for up to 5 kg each.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eOrganize robotics kits, engineering supplies, and coding equipment.\u003c\/li\u003e\n\u003cli\u003eStore science lab materials and classroom manipulatives.\u003c\/li\u003e\n\u003cli\u003eCreate flexible storage for makerspaces and innovation labs.\u003c\/li\u003e\n\u003cli\u003eManage shared classroom resources in libraries and resource centers.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48602864255225,"sku":"CADD252144020202","price":3094.38,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CADD252144020202_-_Callero_Custom_Tall_Flexi-Store_Adder_Unit_16_Shallow_8_Deep_4_Jumbo_Sunshine_Yellow_Tra.avif?v=1782626172"},{"product_id":"gratnells-callero-custom-low-level-4-deep-4-jumbo-tray-adder-unit-sunshine-yellow","title":"Gratnells Callero Custom Low Level 4 Deep \u0026 4 Jumbo Tray Adder Unit – Silver Frame with Sunshine Yellow Trays","description":"\u003cp\u003eThe Gratnells Callero Custom Low Level 4 Deep \u0026amp; 4 Jumbo Tray Adder Unit provides flexible, high-capacity storage for modern STEM classrooms, libraries, and makerspaces. Combining deep and jumbo trays within a compact footprint, it helps educators organize everything from robotics kits to science equipment while keeping materials accessible for students.\u003c\/p\u003e\n\n\u003cp\u003eBuilt with a durable steel frame and Gratnells' trusted tray system, this modular storage unit can be added to larger Callero Custom configurations as your learning space grows. Its low-profile design also doubles as a practical classroom work surface or display area.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eThis storage unit supports organized, student-centered learning by making classroom resources easy to access and manage. The combination of deep and jumbo trays accommodates a wide variety of STEM materials, helping teachers create efficient, flexible learning environments that adapt to changing instructional needs.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eIncludes 4 deep trays and 4 jumbo trays for versatile storage capacity.\u003c\/li\u003e\n\u003cli\u003eLow-profile modular frame integrates seamlessly with Callero Custom storage systems.\u003c\/li\u003e\n\u003cli\u003eCompact footprint maximizes storage without taking up valuable classroom space.\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being accidentally removed.\u003c\/li\u003e\n\u003cli\u003eStrong steel frame supports up to 250 kg total load capacity.\u003c\/li\u003e\n\u003cli\u003eDurable polypropylene trays resist everyday classroom wear and are easy to clean.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eOrganize robotics, engineering, and STEM project materials.\u003c\/li\u003e\n\u003cli\u003eStore science lab equipment and classroom supplies.\u003c\/li\u003e\n\u003cli\u003eCreate flexible storage in makerspaces and innovation labs.\u003c\/li\u003e\n\u003cli\u003eSupport classroom libraries, resource centers, and collaborative learning spaces.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48602870382841,"sku":"CADD2544020202","price":1603.03,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CADD2544020202_-_Callero_Custom_Low_Treble_Adder_Unit_4_Deep_4_Jumbo_Sunshine_Yellow_Trays.avif?v=1782626680"},{"product_id":"gratnells-callero-custom-tall-maker-store-adder-unit-12-shallow-15-deep-sunshine-yellow","title":"Gratnells Callero Custom Tall Maker Store Adder Unit with 12 Shallow \u0026 15 Deep Sunshine Yellow Trays (Silver Frame)","description":"\u003cp\u003eThe Gratnells Callero Custom Tall Maker Store Adder Unit is a modular classroom storage solution designed to expand existing Callero Custom storage systems. Featuring 12 shallow trays and 15 deep trays, it provides high-capacity organization for STEM supplies, maker materials, robotics components, classroom resources, and project equipment while maximizing valuable floor space.\u003c\/p\u003e\n\n\u003cp\u003eBuilt with a durable steel frame and Gratnells' trusted tray system, this tall storage unit helps educators create organized, accessible learning environments that encourage student independence and support hands-on instruction.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eIdeal for STEM classrooms, makerspaces, libraries, innovation labs, and collaborative learning environments, this modular adder unit makes it easy to organize a wide variety of teaching materials. The flexible design allows schools to expand storage as programs grow while maintaining a clean, efficient classroom layout.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eIncludes 12 shallow and 15 deep removable Sunshine Yellow storage trays.\u003c\/li\u003e\n\u003cli\u003eDesigned as an adder unit for expanding Callero Custom storage systems.\u003c\/li\u003e\n\u003cli\u003eTall, space-efficient frame maximizes storage with a minimal footprint.\u003c\/li\u003e\n\u003cli\u003eHeavy-duty steel frame supports up to 250 kg total load capacity.\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being pulled out too far for improved classroom safety.\u003c\/li\u003e\n\u003cli\u003eCompatible with Gratnells classroom trays and accessories for flexible organization.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eOrganize robotics, engineering, and maker education supplies.\u003c\/li\u003e\n\u003cli\u003eStore science lab materials and classroom equipment.\u003c\/li\u003e\n\u003cli\u003eCreate organized resource centers in libraries and STEM labs.\u003c\/li\u003e\n\u003cli\u003eManage classroom manipulatives, art supplies, and shared learning materials.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48602881065209,"sku":"CADD340744020202","price":3259.69,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CADD340744020202_-_Callero_Custom_Tall_Maker-Store_Adder_Unit_12_Shallow_3_Deep_Tilting_12_Deep_Sunshine_Ye.avif?v=1782627187"},{"product_id":"gratnells-callero-custom-tall-maker-store-adder-unit-12-shallow-15-deep-royal-blue","title":"Gratnells Callero Custom Tall Maker Store Adder Unit with 12 Shallow \u0026 15 Deep Royal Blue Trays","description":"\u003cp\u003eThe Gratnells Callero Custom Tall Maker Store Adder Unit is a modular classroom storage solution designed to maximize organization while using minimal floor space. Featuring 12 shallow and 15 deep Royal Blue trays, this tall storage frame provides flexible storage for STEM resources, maker materials, classroom supplies, and learning equipment. Its durable steel frame and smooth tray system help create safe, organized, and efficient learning environments.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eSchools, makerspaces, libraries, and STEM classrooms need storage that can adapt as learning spaces evolve. This Callero Custom adder unit expands existing storage systems while keeping teaching materials easily accessible, supporting independent learning and helping classrooms stay organized throughout the school day.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eIncludes 12 shallow and 15 deep Royal Blue storage trays for organizing a wide variety of classroom materials.\u003c\/li\u003e\n  \u003cli\u003eTall modular adder frame expands compatible Callero Custom storage systems.\u003c\/li\u003e\n  \u003cli\u003eCompact 440 mm depth delivers high-capacity storage without occupying excessive classroom space.\u003c\/li\u003e\n  \u003cli\u003eStopSafe runners help prevent trays from being fully removed, improving classroom safety.\u003c\/li\u003e\n  \u003cli\u003eDurable steel frame supports up to 250 kg for long-lasting educational use.\u003c\/li\u003e\n  \u003cli\u003eAntimicrobial-compatible Gratnells tray system helps support clean, organized learning environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eOrganize STEM kits, robotics components, and engineering supplies.\u003c\/li\u003e\n  \u003cli\u003eStore makerspace tools, craft materials, and design resources.\u003c\/li\u003e\n  \u003cli\u003eCreate accessible classroom resource stations for independent learning.\u003c\/li\u003e\n  \u003cli\u003eExpand storage in science labs, libraries, innovation hubs, and collaborative learning spaces.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48602980974841,"sku":"CADD340744060606","price":3259.69,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CADD340744060606_-_Callero_Custom_Tall_Maker-Store_Adder_Unit_12_Shallow_3_Deep_Tilting_12_Deep_Royal_Blue.avif?v=1782633512"},{"product_id":"gratnells-callero-tall-maker-store-adder-unit-12-shallow-15-deep-flame-red","title":"Gratnells Callero Tall Maker Store Adder Unit with 12 Shallow \u0026 15 Deep Trays – Flame Red","description":"\u003cp\u003eThe Gratnells Callero Tall Maker Store Adder Unit provides high-capacity classroom storage in a slim, space-saving footprint. Designed for schools, STEM labs, makerspaces, and resource rooms, it includes 12 shallow and 15 deep Flame Red trays to keep teaching materials, equipment, and student projects organized and easily accessible.\u003c\/p\u003e\n\n\u003cp\u003eBuilt around the trusted Gratnells tray system, this modular adder unit expands existing Callero Custom storage installations while creating a safe, efficient learning environment that supports hands-on education and independent access to classroom resources.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eEducational spaces require flexible storage that adapts as programs grow. The Callero Tall Maker Store Adder Unit helps teachers organize STEM supplies, robotics components, art materials, science equipment, and classroom resources while maximizing storage capacity without taking up excessive floor space. Its modular design makes it ideal for schools building scalable learning environments.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eIncludes 12 shallow and 15 deep Flame Red trays for organized classroom storage.\u003c\/li\u003e\n\u003cli\u003eModular adder unit expands existing Callero Custom storage systems.\u003c\/li\u003e\n\u003cli\u003eCompact 440 mm depth provides high-capacity storage while conserving valuable classroom space.\u003c\/li\u003e\n\u003cli\u003eSteel frame supports up to 250 kg with durable polypropylene trays rated for 5 kg each.\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being pulled out too far, improving classroom safety.\u003c\/li\u003e\n\u003cli\u003eRounded frame design minimizes sharp edges for child-friendly educational environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eOrganize robotics, engineering, and STEM project materials.\u003c\/li\u003e\n\u003cli\u003eStore science lab equipment and classroom resources.\u003c\/li\u003e\n\u003cli\u003eCreate efficient makerspace supply stations.\u003c\/li\u003e\n\u003cli\u003eSupport library, art, and collaborative learning environments.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48602984055033,"sku":"CADD340744090909","price":3259.69,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CADD340744090909_-_Callero_Custom_Tall_Maker-Store_Adder_Unit_12_Shallow_3_Deep_Tilting_12_Deep_Flame_Red_T.avif?v=1782634071"},{"product_id":"gratnells-callero-tall-maker-store-adder-unit-12-shallow-15-deep-light-gray-trays","title":"Gratnells Callero Tall Maker Store Adder Unit with 12 Shallow \u0026 15 Deep Light Gray Trays","description":"\u003cp\u003eThe Gratnells Callero Tall Maker Store Adder Unit is a high-capacity classroom storage solution designed to help schools organize STEM materials, maker supplies, robotics components, and everyday learning resources. Featuring 12 shallow trays and 15 deep trays in Light Gray, this modular storage unit maximizes storage while maintaining a compact footprint, making it ideal for modern classrooms, makerspaces, and libraries.\u003c\/p\u003e\n\n\u003cp\u003eDesigned as part of the expandable Callero Custom system, this adder unit connects with compatible starter frames to create customized storage walls that grow alongside classroom needs. Rounded steel construction and StopSafe runners help create a safer learning environment while keeping supplies organized and accessible.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eSTEM classrooms require organized, flexible storage that adapts to changing projects and teaching spaces. The Callero Maker Store Adder Unit helps educators keep equipment, consumables, and student materials neatly arranged while improving accessibility, classroom efficiency, and independent student learning.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eIncludes 12 shallow and 15 deep Light Gray trays for high-capacity organization.\u003c\/li\u003e\n\u003cli\u003eExpandable adder unit integrates with the Gratnells Callero Custom storage system.\u003c\/li\u003e\n\u003cli\u003eCompact 16.9-inch depth provides maximum storage with a minimal classroom footprint.\u003c\/li\u003e\n\u003cli\u003eDurable steel frame supports up to 250 kg with trays rated for up to 5 kg each.\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being fully removed for added classroom safety.\u003c\/li\u003e\n\u003cli\u003eRounded frame design minimizes sharp edges, making it suitable for student learning spaces.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eOrganize STEM kits, robotics components, and engineering supplies.\u003c\/li\u003e\n\u003cli\u003eStore classroom maker materials and fabrication tools.\u003c\/li\u003e\n\u003cli\u003eCreate centralized resource storage for science labs and innovation spaces.\u003c\/li\u003e\n\u003cli\u003eManage shared classroom materials in libraries, media centers, and collaborative learning environments.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48602987528441,"sku":"CADD340744191919","price":3259.69,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CADD340744191919_-_Callero_Custom_Tall_Maker-Store_Adder_Unit_12_Shallow_3_Deep_Tilting_12_Deep_Light_Grey.avif?v=1782634616"},{"product_id":"gratnells-callero-tall-maker-store-adder-unit-12-shallow-15-deep-translucent-trays","title":"Gratnells Callero Tall Maker Store Adder Unit with 12 Shallow \u0026 15 Deep Translucent Trays – Silver Frame","description":"\u003cp\u003eThe Gratnells Callero Tall Maker Store Adder Unit provides high-capacity classroom storage for STEM resources, maker materials, robotics components, and everyday teaching supplies. Featuring a durable silver steel frame with 12 shallow and 15 deep translucent trays, it helps educators keep learning environments organized while making materials easy to find and access.\u003c\/p\u003e\n\n\u003cp\u003eDesigned for expanding existing Callero Custom storage systems, this adder unit maximizes storage without taking up unnecessary classroom space. Its smooth-edged construction and StopSafe runners create a safer, more student-friendly storage solution for schools, makerspaces, libraries, and innovation labs.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eOrganized classrooms support better learning experiences. The combination of shallow and deep trays allows teachers to separate small STEM components from larger classroom resources, while the translucent trays make it easy to quickly identify stored materials. Its modular design is ideal for growing STEM programs and flexible learning spaces.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eIncludes 12 shallow and 15 deep translucent trays for versatile classroom organization.\u003c\/li\u003e\n\u003cli\u003eCompatible with Gratnells Callero Custom modular storage systems for easy expansion.\u003c\/li\u003e\n\u003cli\u003eHeavy-duty steel frame supports up to 250 kg of distributed load.\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being fully removed during everyday classroom use.\u003c\/li\u003e\n\u003cli\u003eSlim 440 mm depth maximizes storage while conserving valuable floor space.\u003c\/li\u003e\n\u003cli\u003eRounded frame design improves safety in student learning environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eStore robotics kits, engineering supplies, and maker tools.\u003c\/li\u003e\n\u003cli\u003eOrganize STEM consumables, electronics, and science equipment.\u003c\/li\u003e\n\u003cli\u003eCreate accessible classroom storage for shared learning materials.\u003c\/li\u003e\n\u003cli\u003eExpand makerspaces, libraries, and innovation labs with modular storage.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48603012595961,"sku":"CADD340744202020","price":3259.69,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CADD340744202020_-_Callero_Custom_Tall_Maker-Store_Adder_Unit_12_Shallow_3_Deep_Tilting_12_Deep_Translucent.avif?v=1782636056"},{"product_id":"gratnells-callero-tall-maker-store-adder-unit-12-shallow-15-deep-cyan-blue","title":"Gratnells Callero Tall Maker Store Adder Unit with 12 Shallow \u0026 15 Deep Cyan Blue Trays","description":"\u003cp\u003eThe Gratnells Callero Tall Maker Store Adder Unit is a modular classroom storage solution designed to maximize organization while minimizing floor space. Featuring 12 shallow and 15 deep Cyan Blue trays, this high-capacity unit keeps STEM materials, classroom resources, robotics components, and maker supplies organized, accessible, and ready for daily learning.\u003c\/p\u003e\n\n\u003cp\u003eBuilt with a durable steel frame and Gratnells' trusted tray system, this adder unit expands existing Callero Custom storage configurations to create flexible storage walls that grow alongside evolving classroom needs.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eSchools, makerspaces, STEM labs, and libraries rely on the Callero Custom system to create organized learning environments that support independent student access and efficient classroom management. Its modular design allows educators to expand storage as programs grow while maintaining a clean, safe, and professional learning space.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eIncludes 12 shallow and 15 deep Cyan Blue storage trays for versatile organization.\u003c\/li\u003e\n\u003cli\u003eModular adder unit expands existing Callero Custom storage systems.\u003c\/li\u003e\n\u003cli\u003eSpace-saving tall frame provides high-capacity storage within a compact footprint.\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being fully removed, improving classroom safety.\u003c\/li\u003e\n\u003cli\u003eHeavy-duty steel frame supports up to 250 kg with durable polypropylene trays.\u003c\/li\u003e\n\u003cli\u003eSmooth, rounded frame design enhances safety in student learning environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eOrganize robotics kits, engineering components, and STEM supplies.\u003c\/li\u003e\n\u003cli\u003eCreate accessible storage for makerspaces, innovation labs, and fabrication classrooms.\u003c\/li\u003e\n\u003cli\u003eStore science equipment, art materials, and classroom manipulatives.\u003c\/li\u003e\n\u003cli\u003eExpand school resource centers and collaborative learning environments with modular storage.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48603067056377,"sku":"CADD340744262626","price":3259.69,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CADD340744262626_-_Callero_Custom_Tall_Maker-Store_Adder_Unit_12_Shallow_3_Deep_Tilting_12_Deep_Cyan_Blue_T.avif?v=1782636729"},{"product_id":"gratnells-callero-tall-maker-store-adder-unit-12-shallow-15-deep-kiwi-antimicrobial-trays","title":"Gratnells Callero Tall Maker Store Adder Unit with 12 Shallow \u0026 15 Deep Kiwi Antimicrobial Trays","description":"\u003cp\u003eThe Gratnells Callero Tall Maker Store Adder Unit provides high-capacity classroom storage designed to keep STEM resources organized, accessible, and ready for daily learning. Featuring 12 shallow and 15 deep Kiwi antimicrobial trays within a durable silver steel frame, this modular storage unit helps maximize storage while using minimal floor space.\u003c\/p\u003e\n\n\u003cp\u003eIdeal for expanding existing Callero Custom storage systems, the adder unit creates an organized environment where students and educators can easily access tools, supplies, robotics components, science materials, and maker resources.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eSchools, makerspaces, libraries, and STEM labs rely on flexible storage solutions that can grow alongside changing classroom needs. The Callero Custom system supports organized, student-friendly learning spaces while antimicrobial trays and built-in safety features help create a cleaner and safer educational environment.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eIncludes 12 shallow and 15 deep Kiwi antimicrobial Gratnells trays for versatile storage.\u003c\/li\u003e\n\u003cli\u003eModular adder unit expands existing Callero Custom classroom storage systems.\u003c\/li\u003e\n\u003cli\u003eCompact footprint provides high-density storage without sacrificing valuable classroom space.\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being accidentally removed for improved classroom safety.\u003c\/li\u003e\n\u003cli\u003eRounded frame design minimizes sharp edges for student-friendly learning environments.\u003c\/li\u003e\n\u003cli\u003eHeavy-duty steel frame supports up to 250 kg with trays rated for up to 5 kg each.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eOrganize robotics, engineering, and maker supplies.\u003c\/li\u003e\n\u003cli\u003eStore STEM kits, electronics, and classroom resources.\u003c\/li\u003e\n\u003cli\u003eCreate expandable storage walls for makerspaces and innovation labs.\u003c\/li\u003e\n\u003cli\u003eSupport independent student access to learning materials.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48603226538233,"sku":"CADD340744292929","price":3259.69,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CADD340744292929_-_Callero_Custom_Tall_Maker-Store_Adder_Unit_12_Shallow_3_Deep_Tilting_12_Deep_Kiwi_Green.avif?v=1782641295"},{"product_id":"gratnells-callero-tall-maker-store-adder-unit-jolly-lime-12-shallow-15-deep-trays","title":"Gratnells Callero Tall Maker Store Adder Unit with 12 Shallow \u0026 15 Deep Trays – Jolly Lime","description":"\u003cp\u003eThe Gratnells Callero Tall Maker Store Adder Unit is a modular classroom storage solution designed to maximize organization while minimizing floor space. Featuring 12 shallow and 15 deep Jolly Lime trays, it provides high-capacity storage for STEM materials, maker supplies, robotics components, and everyday classroom resources. Its durable steel frame and antimicrobial Gratnells trays help create a safe, organized learning environment.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eSchools, makerspaces, libraries, and STEM labs rely on the Callero Custom system because it adapts to evolving classroom needs. The modular design makes it easy to expand storage over time while keeping learning materials accessible, organized, and ready for hands-on instruction.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eIncludes 12 shallow and 15 deep Jolly Lime trays for flexible classroom organization.\u003c\/li\u003e\n  \u003cli\u003eHeavy-duty steel frame supports up to 250 kg of evenly distributed storage.\u003c\/li\u003e\n  \u003cli\u003eStopSafe runners help prevent trays from being accidentally removed for improved classroom safety.\u003c\/li\u003e\n  \u003cli\u003eAntimicrobial polypropylene trays are durable and easy to clean.\u003c\/li\u003e\n  \u003cli\u003eCompact 16.9-inch frame depth provides high-density storage without taking up valuable classroom space.\u003c\/li\u003e\n  \u003cli\u003eModular Callero Custom design allows additional storage frames to be added as needs grow.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eOrganize robotics, engineering, and STEM project materials.\u003c\/li\u003e\n  \u003cli\u003eStore maker tools, electronics, and fabrication supplies.\u003c\/li\u003e\n  \u003cli\u003eManage classroom manipulatives and shared learning resources.\u003c\/li\u003e\n  \u003cli\u003eCreate organized storage systems in makerspaces, libraries, and innovation labs.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48603233353977,"sku":"CADD340744363636","price":3259.69,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CADD340744363636_-_Callero_Custom_Tall_Maker-Store_Adder_Unit_12_Shallow_3_Deep_Tilting_12_Deep_Jolly_Lime.avif?v=1782641908"},{"product_id":"gratnells-callero-tall-maker-adder-unit-28-shallow-7-deep-sunshine-yellow","title":"Gratnells Callero Tall Maker Adder Unit with 28 Shallow \u0026 7 Deep Sunshine Yellow Trays – Silver Frame","description":"\u003cp\u003eThe Gratnells Callero Tall Maker Adder Unit is a high-capacity classroom storage solution designed to keep STEM materials, maker supplies, and everyday learning resources organized and easy to access. Featuring a durable silver steel frame with 28 shallow and 7 deep Sunshine Yellow trays, it helps maximize storage while maintaining a compact footprint.\u003c\/p\u003e\n\n\u003cp\u003eBuilt for schools, makerspaces, libraries, and innovation labs, this modular storage unit supports flexible classroom layouts and can be expanded alongside additional Callero Custom frames as storage needs grow.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eModern STEM classrooms require organized, accessible storage that encourages student independence while reducing classroom clutter. The Callero Tall Maker Adder Unit provides high-density storage with removable trays, antimicrobial tray options, and integrated safety features that make it ideal for busy educational environments.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eIncludes 28 shallow trays and 7 deep trays for organizing a wide variety of classroom materials.\u003c\/li\u003e\n\u003cli\u003eCompact tall frame maximizes storage capacity while minimizing floor space.\u003c\/li\u003e\n\u003cli\u003eCompatible with the modular Callero Custom system for future classroom expansion.\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being accidentally removed, improving classroom safety.\u003c\/li\u003e\n\u003cli\u003eDurable steel frame supports up to 250 kg of evenly distributed load.\u003c\/li\u003e\n\u003cli\u003eRemovable polypropylene trays each support up to 5 kg and simplify resource distribution and cleanup.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eStore robotics kits, engineering components, and maker supplies.\u003c\/li\u003e\n\u003cli\u003eOrganize STEM manipulatives, classroom tools, and science equipment.\u003c\/li\u003e\n\u003cli\u003eCreate efficient resource stations in makerspaces and innovation labs.\u003c\/li\u003e\n\u003cli\u003eSupport collaborative classrooms with clearly organized student materials.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48603245215993,"sku":"CADD342144020202","price":3359.14,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CADD342144020202_-_Callero_Custom_Tall_Maker-tall_Adder_Unit_28_Shallow_3_Deep_Tilting_4_Deep_Sunshine_Yellow.avif?v=1782642321"},{"product_id":"gratnells-callero-tall-maker-adder-storage-unit-28-shallow-7-deep-royal-blue","title":"Gratnells Callero Tall Maker Adder Storage Unit with 28 Shallow \u0026 7 Deep Royal Blue Trays","description":"\u003cp\u003eThe Gratnells Callero Tall Maker Adder Unit is a modular classroom storage solution designed to maximize organization while minimizing floor space. Featuring 28 shallow and 7 deep Royal Blue trays, it provides flexible storage for STEM equipment, classroom supplies, robotics components, and maker materials. Its durable steel frame and student-friendly design make it ideal for busy learning environments.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eSchools, makerspaces, libraries, and STEM labs rely on the Callero system to keep learning materials organized, accessible, and ready for instruction. The expandable modular design allows storage systems to grow alongside evolving classroom needs while supporting safe, independent student access.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eIncludes 28 shallow and 7 deep Royal Blue trays for organized classroom storage\u003c\/li\u003e\n\u003cli\u003eTall modular adder unit expands existing Callero Custom storage systems\u003c\/li\u003e\n\u003cli\u003eCompact footprint provides high-capacity storage without sacrificing classroom space\u003c\/li\u003e\n\u003cli\u003eSteel frame supports up to 250 kg with 5 kg capacity per tray\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being fully removed for added classroom safety\u003c\/li\u003e\n\u003cli\u003eSmooth, rounded frame design is well suited for student learning environments\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eStore robotics kits, engineering components, and STEM project materials\u003c\/li\u003e\n\u003cli\u003eOrganize classroom makerspace tools and consumable supplies\u003c\/li\u003e\n\u003cli\u003eCreate accessible resource storage for science and technology labs\u003c\/li\u003e\n\u003cli\u003eSupport collaborative learning with clearly organized student materials\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48603369570553,"sku":"CADD342144060606","price":3359.14,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CADD342144060606_-_Callero_Custom_Tall_Maker-tall_Adder_Unit_28_Shallow_3_Deep_Tilting_4_Deep_Royal_Blue_Tray.avif?v=1782648098"},{"product_id":"gratnells-callero-tall-maker-adder-unit-28-shallow-7-deep-flame-red-trays","title":"Gratnells Callero Tall Maker Adder Unit with 28 Shallow \u0026 7 Deep Flame Red Trays – Silver Frame","description":"\u003cp\u003eThe Gratnells Callero Tall Maker Adder Unit is a modular classroom storage solution designed to maximize organization while using minimal floor space. Featuring a durable silver steel frame with 28 shallow and 7 deep Flame Red trays, it provides flexible storage for STEM materials, classroom supplies, robotics components, and maker resources. Its expandable design makes it easy for schools to build organized learning environments that grow with their needs.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eIdeal for STEM classrooms, makerspaces, libraries, and innovation labs, this storage unit helps teachers keep materials accessible, organized, and ready for instruction. The combination of shallow and deep trays supports everything from small engineering components to larger classroom equipment while promoting student independence and efficient classroom management.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eIncludes 28 shallow trays and 7 deep Flame Red trays for versatile classroom storage.\u003c\/li\u003e\n\u003cli\u003eHeavy-duty steel frame supports up to 250 kg of distributed weight.\u003c\/li\u003e\n\u003cli\u003eCompact footprint maximizes storage without sacrificing valuable classroom space.\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being accidentally removed.\u003c\/li\u003e\n\u003cli\u003eSmooth, rounded frame design enhances safety in student learning environments.\u003c\/li\u003e\n\u003cli\u003eModular Callero system allows additional units to be added as storage needs grow.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eOrganize robotics, engineering, and STEM project materials.\u003c\/li\u003e\n\u003cli\u003eStore classroom tools, consumables, and science lab supplies.\u003c\/li\u003e\n\u003cli\u003eCreate accessible makerspace storage for student projects.\u003c\/li\u003e\n\u003cli\u003eSupport library, media center, and collaborative learning environments.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48603382677753,"sku":"CADD342144090909","price":3359.14,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CADD342144090909_-_Callero_Custom_Tall_Maker-tall_Adder_Unit_28_Shallow_3_Deep_Tilting_4_Deep_Flame_Red_Trays.avif?v=1782648803"},{"product_id":"gratnells-callero-tall-maker-adder-storage-unit-28-shallow-7-deep-light-gray","title":"Gratnells Callero Tall Maker Adder Storage Unit with 28 Shallow \u0026 7 Deep Light Gray Trays","description":"\u003cp\u003eThe Gratnells Callero Tall Maker Adder Storage Unit is a modular classroom storage solution designed to maximize organization while minimizing floor space. Featuring 28 shallow trays and 7 deep light gray trays, it provides high-capacity storage for STEM materials, maker supplies, robotics components, and everyday classroom resources. Its durable steel frame and antimicrobial trays make it well suited for busy learning environments.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eSchools, makerspaces, libraries, and STEM labs rely on the Callero system to keep learning materials organized, accessible, and easy for students to manage independently. Its expandable modular design allows educators to build storage systems that grow alongside changing classroom needs while maintaining a clean and organized learning space.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eIncludes 28 shallow trays and 7 deep light gray trays for flexible storage.\u003c\/li\u003e\n  \u003cli\u003eModular adder unit connects with compatible Callero starter frames to expand storage capacity.\u003c\/li\u003e\n  \u003cli\u003eSpace-saving tall design offers high-density storage with a compact footprint.\u003c\/li\u003e\n  \u003cli\u003eDurable steel frame supports up to 250 kg with trays rated for up to 5 kg each.\u003c\/li\u003e\n  \u003cli\u003eIntegrated StopSafe runners help prevent trays from being accidentally removed.\u003c\/li\u003e\n  \u003cli\u003eSmooth, rounded frame design enhances safety in student learning environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eOrganize robotics, engineering, and maker project materials.\u003c\/li\u003e\n  \u003cli\u003eStore classroom manipulatives, science equipment, and STEM kits.\u003c\/li\u003e\n  \u003cli\u003eCreate expandable resource centers in classrooms and school libraries.\u003c\/li\u003e\n  \u003cli\u003eSupport student independence with clearly organized, accessible storage.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48603394310393,"sku":"CADD342144191919","price":3359.14,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CADD342144191919_-_Callero_Custom_Tall_Maker-tall_Adder_Unit_28_Shallow_3_Deep_Tilting_4_Deep_Light_Grey_Tray.avif?v=1782649702"},{"product_id":"gratnells-callero-tall-maker-adder-storage-unit-28-shallow-7-deep-translucent-silver","title":"Gratnells Callero Tall Maker Adder Storage Unit with 28 Shallow \u0026 7 Deep Translucent Trays – Silver Frame","description":"\u003cp\u003eThe Gratnells Callero Tall Maker Adder Unit provides high-capacity classroom storage in a compact footprint, making it ideal for STEM labs, makerspaces, libraries, and learning environments. Featuring a durable silver steel frame with 28 shallow and 7 deep translucent trays, it helps educators organize materials while keeping supplies visible and easy to access.\u003c\/p\u003e\n\n\u003cp\u003eDesigned for modular classroom layouts, this adder unit expands an existing Callero Custom storage system, allowing schools to create storage solutions that grow alongside their programs.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eSTEM classrooms rely on organized learning spaces where students can independently access tools and materials. The combination of shallow and deep trays supports everything from small electronics and robotics parts to larger classroom resources, while antimicrobial trays and StopSafe runners help create a cleaner and safer learning environment.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eIncludes 28 shallow and 7 deep translucent storage trays for versatile organization.\u003c\/li\u003e\n\u003cli\u003eModular adder unit expands compatible Callero Custom storage systems.\u003c\/li\u003e\n\u003cli\u003eCompact 16.9-inch depth maximizes storage without taking up valuable classroom space.\u003c\/li\u003e\n\u003cli\u003eHeavy-duty steel frame supports up to 250 kg with trays rated for up to 5 kg each.\u003c\/li\u003e\n\u003cli\u003eTranslucent trays allow quick identification of stored materials.\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being accidentally removed, improving classroom safety.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eOrganize robotics, engineering, and maker project supplies.\u003c\/li\u003e\n\u003cli\u003eStore STEM kits, classroom manipulatives, and lab materials.\u003c\/li\u003e\n\u003cli\u003eCreate expandable storage walls for makerspaces and innovation labs.\u003c\/li\u003e\n\u003cli\u003eSupport student self-service access to shared classroom resources.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48603402699001,"sku":"CADD342144202020","price":3359.14,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CADD342144202020_-_Callero_Custom_Tall_Maker-tall_Adder_Unit_28_Shallow_3_Deep_Tilting_4_Deep_Translucent_Tra.avif?v=1782650253"},{"product_id":"gratnells-callero-tall-maker-adder-unit-28-shallow-7-deep-cyan-blue-trays","title":"Gratnells Callero Tall Maker Adder Unit with 28 Shallow \u0026 7 Deep Cyan Blue Trays","description":"\u003cp\u003eThe Gratnells Callero Tall Maker Adder Unit is a high-capacity classroom storage solution designed to keep STEM materials, maker supplies, and learning resources organized and easily accessible. Featuring 28 shallow and 7 deep Cyan Blue trays, this modular unit helps educators maximize storage while maintaining a compact footprint. Its durable steel frame and child-friendly design make it ideal for busy educational environments.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eSchools, makerspaces, libraries, and STEM labs rely on the Callero storage system to create organized, flexible learning environments. The modular design supports growing classrooms, while antimicrobial trays and StopSafe runners help promote safer, more efficient student access to classroom materials.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eIncludes 28 shallow and 7 deep Cyan Blue storage trays for organizing a wide variety of classroom materials.\u003c\/li\u003e\n\u003cli\u003eCompact tall frame provides high-density storage while using minimal floor space.\u003c\/li\u003e\n\u003cli\u003eHeavy-duty steel frame supports up to 250 kg for long-term classroom durability.\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being fully removed, improving classroom safety.\u003c\/li\u003e\n\u003cli\u003eCompatible with the modular Gratnells Callero system for future expansion.\u003c\/li\u003e\n\u003cli\u003eAntimicrobial polypropylene trays are durable, easy to clean, and designed for everyday educational use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eOrganize robotics, engineering, and STEM project supplies.\u003c\/li\u003e\n\u003cli\u003eStore science lab equipment and classroom consumables.\u003c\/li\u003e\n\u003cli\u003eCreate efficient makerspace storage for tools and materials.\u003c\/li\u003e\n\u003cli\u003eManage shared classroom resources in libraries and innovation labs.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48603414954233,"sku":"CADD342144262626","price":3359.14,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CADD342144262626_-_Callero_Custom_Tall_Maker-tall_Adder_Unit_28_Shallow_3_Deep_Tilting_4_Deep_Cyan_Blue_Trays.avif?v=1782650800"},{"product_id":"gratnells-callero-tall-maker-adder-storage-unit-28-shallow-7-deep-kiwi-antimicrobial-trays","title":"Gratnells Callero Tall Maker Adder Storage Unit with 28 Shallow \u0026 7 Deep Kiwi Antimicrobial Trays (Silver Frame)","description":"\u003cp\u003eThe Gratnells Callero Tall Maker Adder Unit is a high-capacity classroom storage solution designed to keep STEM materials, tools, and learning resources organized while maximizing floor space. Featuring a durable silver steel frame with 28 shallow and 7 deep Kiwi antimicrobial trays, it provides flexible storage for busy classrooms, makerspaces, libraries, and innovation labs.\u003c\/p\u003e\n\n\u003cp\u003eIts modular design allows schools to expand storage as programs grow, while child-friendly safety features help create an organized and accessible learning environment that supports independent student use.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eTeachers and STEM coordinators rely on the Callero storage system to organize equipment, consumables, robotics components, engineering supplies, and classroom resources in one accessible location. The modular frame integrates easily into flexible learning spaces while antimicrobial trays and safety-focused runners support daily classroom use.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eIncludes 28 shallow and 7 deep Kiwi antimicrobial storage trays.\u003c\/li\u003e\n  \u003cli\u003eTall treble-width steel frame with durable silver finish.\u003c\/li\u003e\n  \u003cli\u003eModular design expands with additional Callero storage units.\u003c\/li\u003e\n  \u003cli\u003eStopSafe runners help prevent trays from being fully removed during everyday use.\u003c\/li\u003e\n  \u003cli\u003eCompact footprint provides high-capacity storage without taking up valuable classroom space.\u003c\/li\u003e\n  \u003cli\u003eSupports up to 250 kg frame load with trays rated for up to 5 kg each.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eOrganize STEM lab equipment and engineering materials.\u003c\/li\u003e\n  \u003cli\u003eStore robotics parts, coding kits, and makerspace supplies.\u003c\/li\u003e\n  \u003cli\u003eManage classroom resources for collaborative learning activities.\u003c\/li\u003e\n  \u003cli\u003eCreate accessible storage in libraries, innovation labs, and media centers.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48603456372985,"sku":"CADD342144292929","price":3359.14,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CADD342144292929_-_Callero_Custom_Tall_Maker-tall_Adder_Unit_28_Shallow_3_Deep_Tilting_4_Deep_Kiwi_Green_Tray.avif?v=1782652902"},{"product_id":"gratnells-callero-tall-maker-adder-unit-28-shallow-7-deep-jolly-lime","title":"Gratnells Callero Tall Maker Adder Unit with 28 Shallow \u0026 7 Deep Jolly Lime Trays – Silver Frame","description":"\u003cp\u003eThe Gratnells Callero Tall Maker Adder Unit is a high-capacity classroom storage solution designed to keep STEM resources, maker materials, and teaching supplies organized and easily accessible. Featuring 28 shallow and 7 deep Jolly Lime trays within a durable silver steel frame, it helps maximize storage while minimizing floor space in busy learning environments.\u003c\/p\u003e\n\n\u003cp\u003eBuilt for schools, makerspaces, libraries, and innovation labs, this modular storage unit creates a safer, more organized classroom where students and educators can quickly access materials and maintain productive learning spaces.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eHands-on STEM learning depends on organized access to tools, components, and classroom resources. The Callero Tall Maker Adder Unit supports efficient classroom management by providing flexible, expandable storage that adapts to changing curriculum needs while encouraging student independence through safe, easy-to-access trays.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eIncludes 28 shallow and 7 deep storage trays for organizing a wide variety of classroom materials.\u003c\/li\u003e\n\u003cli\u003eCompact footprint provides high-density storage without taking up valuable instructional space.\u003c\/li\u003e\n\u003cli\u003eDurable steel frame supports up to 250 kg for long-lasting classroom use.\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being fully removed, improving classroom safety.\u003c\/li\u003e\n\u003cli\u003eSmooth, rounded frame design minimizes sharp edges for student-friendly environments.\u003c\/li\u003e\n\u003cli\u003eModular Callero system allows additional storage units to be added as classroom needs grow.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eStore robotics parts, engineering kits, and maker supplies.\u003c\/li\u003e\n\u003cli\u003eOrganize STEM lab equipment and classroom consumables.\u003c\/li\u003e\n\u003cli\u003eCreate accessible resource stations for collaborative learning.\u003c\/li\u003e\n\u003cli\u003eSupport makerspaces, libraries, innovation labs, and technology classrooms.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48603485307129,"sku":"CADD342144363636","price":3359.14,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CADD342144363636_-_Callero_Custom_Tall_Maker-tall_Adder_Unit_28_Shallow_3_Deep_Tilting_4_Deep_Jolly_Lime_Tray.avif?v=1782653657"},{"product_id":"gratnells-callero-custom-low-level-adder-unit-3-deep-12-shallow-sunshine-yellow","title":"Gratnells Callero Custom Low Level Adder Unit with 3 Deep Tilting \u0026 12 Shallow Trays – Sunshine Yellow","description":"\u003cp\u003eThe Gratnells Callero Custom Low Level Adder Unit provides flexible, high-density classroom storage in a compact footprint. Featuring three deep tilting trays and twelve shallow trays in Sunshine Yellow, it helps educators keep STEM materials, maker supplies, robotics components, and classroom resources organized and easily accessible.\u003c\/p\u003e\n\n\u003cp\u003eDesigned as part of the modular Callero Custom system, this low-level adder frame expands existing storage configurations while creating safe, efficient learning environments. Its durable steel frame, antimicrobial tray compatibility, and child-friendly design make it ideal for schools, libraries, makerspaces, and collaborative learning spaces.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eEducational spaces require storage that adapts as programs grow. This modular adder unit allows schools to expand storage without sacrificing valuable classroom space, helping teachers organize materials while supporting independent student access during STEM, engineering, science, and creative learning activities.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eIncludes 3 deep tilting trays and 12 shallow trays for flexible supply organization.\u003c\/li\u003e\n\u003cli\u003eCompact low-level frame maximizes storage while minimizing floor space.\u003c\/li\u003e\n\u003cli\u003eModular adder unit connects seamlessly with existing Callero Custom systems.\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being pulled out too far for added classroom safety.\u003c\/li\u003e\n\u003cli\u003eDurable steel frame supports up to 250 kg with trays rated for 5 kg each.\u003c\/li\u003e\n\u003cli\u003eSmooth, rounded frame design enhances safety in student learning environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eOrganize robotics, engineering, and STEM project materials.\u003c\/li\u003e\n\u003cli\u003eStore classroom manipulatives, science equipment, and maker supplies.\u003c\/li\u003e\n\u003cli\u003eCreate accessible resource stations for collaborative learning.\u003c\/li\u003e\n\u003cli\u003eExpand library, innovation lab, or makerspace storage systems.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48604099674361,"sku":"CADD3444020202","price":1716.93,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CADD3444020202_-_Callero_Custom_Low_Maker_Adder_Unit_3_Deep_Tilting_12_Shallow_Sunshine_Yellow_Trays.avif?v=1782662219"},{"product_id":"gratnells-callero-tall-pick-store-starter-21-deep-sunshine-yellow-trays","title":"Gratnells Callero Custom Tall Pick Store Starter Unit with 21 Deep Sunshine Yellow Trays","description":"\u003cp\u003eThe Gratnells Callero Custom Tall Pick Store Starter Unit provides high-capacity classroom storage in a compact footprint, making it ideal for STEM labs, makerspaces, classrooms, and resource centers. Supplied with 21 deep Sunshine Yellow trays, this modular starter frame helps educators organize equipment, project materials, and learning resources while keeping them easily accessible.\u003c\/p\u003e\n\n\u003cp\u003eDesigned specifically for education environments, the Callero system combines durable steel construction with antimicrobial Gratnells trays and safety-focused features to create an organized, flexible learning space that can expand as storage needs grow.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eSchools and STEM programs rely on modular storage that can adapt alongside evolving curriculum needs. The Callero Custom system allows educators to build organized storage walls, makerspaces, and classroom resource centers while maximizing valuable floor space and maintaining a safe environment for students.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eIncludes 21 deep Sunshine Yellow Gratnells trays for storing larger classroom supplies and STEM materials.\u003c\/li\u003e\n\u003cli\u003eModular starter unit designed to expand with additional Callero Custom frames.\u003c\/li\u003e\n\u003cli\u003eCompact 16.9-inch frame depth maximizes storage without occupying excessive classroom space.\u003c\/li\u003e\n\u003cli\u003eHeavy-duty steel frame supports up to 250 kg with trays rated for up to 5 kg each.\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being pulled out too far for improved classroom safety.\u003c\/li\u003e\n\u003cli\u003eDurable antimicrobial polypropylene trays are built for everyday educational use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eOrganize STEM kits, robotics components, and engineering supplies.\u003c\/li\u003e\n\u003cli\u003eCreate expandable classroom storage walls and resource centers.\u003c\/li\u003e\n\u003cli\u003eStore makerspace tools, consumables, and student project materials.\u003c\/li\u003e\n\u003cli\u003eSupport science labs, libraries, innovation hubs, and shared learning spaces.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48604211970297,"sku":"CSTA010744020202","price":2963.83,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CSTA010744020202_-_Callero_Custom_Tall_Pick-Store_Starter_Unit_9_Tilting_Deep_12_Deep_Sunshine_Yellow_Trays.avif?v=1782662869"},{"product_id":"gratnells-callero-custom-low-level-9-deep-tilting-tray-starter-unit-sunshine-yellow","title":"Gratnells Callero Custom Low-Level 9 Deep Tilting Tray Starter Unit – Sunshine Yellow","description":"\u003cp\u003eThe Gratnells Callero Custom Low-Level 9 Deep Tilting Tray Starter Unit provides compact, high-capacity storage for STEM classrooms, makerspaces, libraries, and learning environments. Featuring nine deep tilting trays in Sunshine Yellow, this modular storage solution keeps classroom materials visible, organized, and easy for students and educators to access.\u003c\/p\u003e\n\n\u003cp\u003eIts low-profile design fits neatly beneath displays or along classroom walls while maximizing storage space. Built with a durable steel frame, antimicrobial trays, and child-friendly safety features, it is designed for everyday educational use.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eTeachers and STEM coordinators rely on this storage unit to organize robotics components, engineering supplies, science equipment, art materials, and classroom resources without sacrificing valuable floor space. The modular Callero system also allows schools to expand storage as classroom needs evolve.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eIncludes 9 deep tilting trays for high-capacity classroom storage\u003c\/li\u003e\n\u003cli\u003eLow-level modular starter unit designed for expandable storage systems\u003c\/li\u003e\n\u003cli\u003eCompact footprint maximizes storage while conserving classroom space\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being pulled out too far for added safety\u003c\/li\u003e\n\u003cli\u003eDurable steel frame supports up to 250 kg with trays rated for 5 kg each\u003c\/li\u003e\n\u003cli\u003eAntimicrobial polypropylene trays are easy to clean and built for daily classroom use\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eOrganize STEM kits, robotics parts, and engineering materials\u003c\/li\u003e\n\u003cli\u003eStore science lab equipment and classroom supplies\u003c\/li\u003e\n\u003cli\u003eCreate accessible storage in makerspaces and innovation labs\u003c\/li\u003e\n\u003cli\u003eManage shared learning resources in libraries and resource centers\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48604330459385,"sku":"CSTA0144020202","price":1451.88,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CSTA0144020202_-_Callero_Custom_Low_Tilted_Tray_Starter_Unit_9_Deep_Sunshine_Yellow_Trays.avif?v=1782663431"},{"product_id":"gratnells-callero-tall-display-store-starter-unit-12-deep-sunshine-yellow-trays","title":"Gratnells Callero Tall Display Store Starter Unit with 12 Deep Sunshine Yellow Trays","description":"\u003cp\u003eThe Gratnells Callero Tall Display Store Starter Unit is a high-capacity classroom storage solution designed to organize STEM materials while keeping them easily accessible. Featuring 12 deep Sunshine Yellow trays within a durable steel frame, it provides efficient storage for equipment, learning resources, and student projects without taking up unnecessary floor space.\u003c\/p\u003e\n\n\u003cp\u003eIts modular design allows schools to expand storage as classrooms evolve, making it an excellent choice for STEM labs, makerspaces, libraries, and collaborative learning environments.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eEducators rely on the Callero Custom system to create organized, flexible learning spaces that support hands-on instruction. Deep trays accommodate larger classroom resources, while the display shelving helps keep frequently used materials visible, accessible, and ready for student use during STEM activities.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eIncludes 12 deep Sunshine Yellow trays for storing larger classroom materials and STEM equipment.\u003c\/li\u003e\n\u003cli\u003eTall treble-width frame maximizes vertical storage while minimizing floor space.\u003c\/li\u003e\n\u003cli\u003eModular Callero Custom design can be expanded with additional compatible units.\u003c\/li\u003e\n\u003cli\u003eIntegrated display shelving supports books, models, teaching aids, and demonstration materials.\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being accidentally removed, improving classroom safety.\u003c\/li\u003e\n\u003cli\u003eHeavy-duty steel frame supports up to 250 kg for long-lasting educational use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eOrganize robotics, engineering, and maker supplies.\u003c\/li\u003e\n\u003cli\u003eCreate accessible STEM resource and project storage stations.\u003c\/li\u003e\n\u003cli\u003eStore science lab equipment and classroom consumables.\u003c\/li\u003e\n\u003cli\u003eDisplay curriculum materials, prototypes, and student work.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48604491415801,"sku":"CSTA070644020202","price":2646.28,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CSTA070644020202_-_Callero_Custom_Tall_Display-Store_Starter_Unit_3_Flat_Shelves_12_Deep_Sunshine_Yellow_Trays.avif?v=1782664153"},{"product_id":"gratnells-callero-tall-high-store-starter-unit-24-deep-trays-sunshine-yellow","title":"Gratnells Callero Tall High-Store Starter Unit with 24 Deep Trays – Sunshine Yellow","description":"\u003cp\u003eThe Gratnells Callero Tall High-Store Starter Unit is a high-capacity classroom storage solution designed to keep STEM learning environments organized, safe, and efficient. Featuring 24 deep Sunshine Yellow trays within a durable silver steel frame, it provides ample storage while maintaining a compact footprint—ideal for classrooms, makerspaces, STEM labs, and libraries.\u003c\/p\u003e\n\n\u003cp\u003eBuilt around the trusted Gratnells tray system, this modular starter unit helps educators create flexible storage that grows alongside changing classroom needs. Its child-friendly design and StopSafe runners support safe daily use while keeping teaching materials easily accessible.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eSchools and educational organizations rely on the Callero storage system to organize hands-on learning resources without sacrificing valuable floor space. Its modular design makes it easy to expand storage as STEM programs evolve, while deep trays simplify the management of equipment, consumables, robotics components, and classroom supplies.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eIncludes 24 deep antimicrobial trays in Sunshine Yellow for high-capacity classroom organization.\u003c\/li\u003e\n\u003cli\u003eTall treble-width steel frame provides up to 250 kg total load capacity.\u003c\/li\u003e\n\u003cli\u003eCompact 440 mm (16.9\") depth maximizes storage while minimizing classroom footprint.\u003c\/li\u003e\n\u003cli\u003eCompatible with the modular Callero Custom system for future expansion.\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being pulled out too far, improving classroom safety.\u003c\/li\u003e\n\u003cli\u003eRounded frame design eliminates sharp edges for child-friendly learning environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eOrganize robotics kits, engineering components, and STEM project materials.\u003c\/li\u003e\n\u003cli\u003eStore science lab equipment and classroom consumables.\u003c\/li\u003e\n\u003cli\u003eCreate centralized resource storage for makerspaces and innovation labs.\u003c\/li\u003e\n\u003cli\u003eKeep shared classroom supplies accessible and neatly organized.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48604630712569,"sku":"CSTA070744020202","price":3356.24,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CSTA070744020202_-_Callero_Custom_Tall_High-Store_Starter_Unit_24_Deep_Sunshine_Yellow_Trays.avif?v=1782664850"},{"product_id":"gratnells-callero-custom-low-level-8-deep-tray-starter-unit-sunshine-yellow","title":"Gratnells Callero Custom Low Level 8 Deep Tray Starter Unit – Silver Frame with Sunshine Yellow Trays","description":"\u003cp\u003eThe Gratnells Callero Custom Low Level 8 Deep Tray Starter Unit is a modular classroom storage solution designed to maximize organization while minimizing floor space. Featuring eight deep Gratnells trays in Sunshine Yellow within a durable silver steel frame, it provides secure, high-capacity storage for STEM materials, classroom supplies, and makerspace resources. Its low-profile design keeps learning materials easily accessible while supporting safe, flexible classroom layouts.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eSchools, makerspaces, libraries, and STEM classrooms rely on the Callero Custom system to create organized, adaptable learning environments. The modular design allows storage systems to expand as classroom needs change, while StopSafe runners and rounded frame construction help create a safer space for students working independently.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eIncludes 8 deep Gratnells trays for high-capacity classroom storage.\u003c\/li\u003e\n\u003cli\u003eCompact low-level design provides easy student access while saving valuable floor space.\u003c\/li\u003e\n\u003cli\u003eHeavy-duty steel frame supports up to 250 kg of distributed load.\u003c\/li\u003e\n\u003cli\u003eEach tray safely holds up to 5 kg of classroom materials and STEM equipment.\u003c\/li\u003e\n\u003cli\u003eCompatible with the modular Callero Custom system for future expansion.\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being fully removed during everyday use.\u003c\/li\u003e\n\u003cli\u003eRounded frame design minimizes sharp edges for enhanced classroom safety.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eOrganize robotics kits, engineering supplies, and STEM project materials.\u003c\/li\u003e\n\u003cli\u003eCreate accessible storage for makerspaces, innovation labs, and libraries.\u003c\/li\u003e\n\u003cli\u003eStore classroom manipulatives, science equipment, and art resources.\u003c\/li\u003e\n\u003cli\u003eBuild flexible storage walls that can expand alongside changing classroom needs.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48604898033913,"sku":"CSTA13440202","price":1495.41,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CSTA13440202_-_Callero_Custom_Low_Double_Starter_Unit_8_Deep_Sunshine_Yellow_Trays.avif?v=1782666061"},{"product_id":"gratnells-callero-custom-tall-slim-store-starter-unit-16-shallow-8-deep-sunshine-yellow","title":"Gratnells Callero Custom Tall Slim Store Starter Unit with 16 Shallow \u0026 8 Deep Trays – Sunshine Yellow","description":"\u003cp\u003eThe Gratnells Callero Custom Tall Slim Store Starter Unit is a high-capacity classroom storage solution designed to organize teaching materials while using minimal floor space. Featuring a slim steel frame with 16 shallow and 8 deep trays, it helps educators keep STEM resources, classroom supplies, and learning materials accessible, organized, and ready for everyday instruction.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eIdeal for STEM classrooms, makerspaces, libraries, and collaborative learning environments, this modular storage unit supports efficient resource management while maintaining a clean, organized classroom. Its expandable design allows schools to build customized storage systems that adapt as instructional needs grow.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eIncludes 16 shallow and 8 deep Gratnells trays for versatile classroom storage.\u003c\/li\u003e\n\u003cli\u003eSpace-saving tall, slim design maximizes storage without occupying valuable teaching space.\u003c\/li\u003e\n\u003cli\u003eDurable steel frame supports loads up to 250 kg for long-term educational use.\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being fully removed, improving classroom safety.\u003c\/li\u003e\n\u003cli\u003eModular starter unit can be expanded with additional Callero Custom frames.\u003c\/li\u003e\n\u003cli\u003eSmooth, rounded frame design reduces sharp edges for child-friendly learning environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eOrganize robotics, engineering, and STEM project materials.\u003c\/li\u003e\n\u003cli\u003eStore classroom manipulatives, science equipment, and art supplies.\u003c\/li\u003e\n\u003cli\u003eCreate organized resource centers in libraries and media spaces.\u003c\/li\u003e\n\u003cli\u003eSupport makerspaces with clearly separated tools and components.\u003c\/li\u003e\n\u003cli\u003eBuild scalable storage systems across classrooms, labs, and collaborative learning areas.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48605259596025,"sku":"CSTA1818440202","price":3045.8,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CSTA1818440202_-_Callero_Custom_Tall_Slim-Store_Starter_Unit_16_Shallow_8_Deep_Sunshine_Yellow_Trays.avif?v=1782667209"},{"product_id":"gratnells-callero-custom-low-level-8-shallow-4-deep-tray-starter-unit-sunshine-yellow","title":"Gratnells Callero Custom Low Level 8 Shallow \u0026 4 Deep Tray Starter Unit – Sunshine Yellow","description":"\u003cp\u003eThe Gratnells Callero Custom Low Level Starter Unit provides flexible, high-capacity classroom storage in a compact footprint. Featuring eight shallow trays and four deep trays, it helps educators organize STEM materials, classroom supplies, robotics components, maker resources, and learning tools while keeping everything accessible for students.\u003c\/p\u003e\n\n\u003cp\u003eDesigned specifically for educational environments, the low-profile frame supports independent learning, improves classroom organization, and adapts easily as teaching spaces evolve. Its modular design also allows additional units to be added as storage needs grow.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eTeachers, makerspaces, libraries, and STEM labs benefit from organized storage that keeps learning materials visible, accessible, and ready for daily use. The combination of shallow and deep trays accommodates everything from small manipulatives to larger classroom resources while supporting efficient classroom management.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eIncludes 8 shallow trays and 4 deep trays for versatile classroom organization.\u003c\/li\u003e\n\u003cli\u003eCompact low-profile design maximizes storage while preserving valuable floor space.\u003c\/li\u003e\n\u003cli\u003eDurable steel frame supports loads up to 250 kg for demanding educational environments.\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being pulled out too far, improving classroom safety.\u003c\/li\u003e\n\u003cli\u003eModular Callero Custom system expands easily with additional compatible frames.\u003c\/li\u003e\n\u003cli\u003eSmooth rounded frame design minimizes sharp edges for student-friendly learning spaces.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eOrganize STEM kits, robotics parts, engineering supplies, and maker materials.\u003c\/li\u003e\n\u003cli\u003eCreate accessible storage in elementary and secondary classrooms.\u003c\/li\u003e\n\u003cli\u003eStore library resources, art supplies, and shared classroom equipment.\u003c\/li\u003e\n\u003cli\u003eSupport makerspaces, innovation labs, and collaborative learning environments.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48609320796409,"sku":"CSTA18440202","price":1481.55,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CSTA18440202_-_Callero_Custom_Low_Double_Starter_Unit_8_Shallow_4_Deep_Sunshine_Yellow_Trays.avif?v=1782798978"},{"product_id":"gratnells-callero-custom-low-level-16-shallow-4-deep-tray-starter-unit-sunshine-yellow","title":"Gratnells Callero Custom Low Level 16 Shallow \u0026 4 Deep Tray Starter Unit – Silver Frame with Sunshine Yellow Trays","description":"\u003cp\u003eThe Gratnells Callero Custom Low Level Starter Unit provides high-capacity classroom storage in a compact footprint. Featuring 16 shallow trays and 4 deep trays, it helps educators organize a wide variety of STEM materials, classroom supplies, robotics components, and hands-on learning resources while keeping them easily accessible.\u003c\/p\u003e\n\n\u003cp\u003eDesigned for modern learning environments, the low-profile frame supports safe student access and flexible classroom layouts. Its modular design allows schools to expand storage as programs grow, making it an excellent long-term solution for classrooms, libraries, innovation spaces, and makerspaces.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eKeeping learning materials organized helps maximize instructional time and encourages student independence. The combination of shallow and deep trays supports efficient storage of everything from small science tools to larger project materials, while the durable steel frame is built for daily educational use.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eIncludes 16 shallow trays and 4 deep trays for flexible classroom organization.\u003c\/li\u003e\n  \u003cli\u003eCompact low-level design fits beneath displays, windows, and collaborative workspaces.\u003c\/li\u003e\n  \u003cli\u003eDurable steel frame supports up to 250 kg for demanding school environments.\u003c\/li\u003e\n  \u003cli\u003eStopSafe runners help prevent trays from being fully removed, improving classroom safety.\u003c\/li\u003e\n  \u003cli\u003eModular Callero Custom system expands easily as storage needs grow.\u003c\/li\u003e\n  \u003cli\u003eSmooth, rounded frame design enhances safety in student learning spaces.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eOrganize STEM kits, robotics parts, engineering supplies, and science materials.\u003c\/li\u003e\n  \u003cli\u003eStore classroom manipulatives and project resources by subject or grade level.\u003c\/li\u003e\n  \u003cli\u003eCreate accessible storage stations in makerspaces and innovation labs.\u003c\/li\u003e\n  \u003cli\u003eSupport collaborative learning by keeping materials visible and within student reach.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48609326301433,"sku":"CSTA2144020202","price":1725.1,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CSTA2144020202_-_Callero_Custom_Low_Treble_Starter_Unit_16_Shallow_4_Deep_Sunshine_Yellow_Trays.avif?v=1782799677"},{"product_id":"gratnells-callero-custom-tall-flexi-store-starter-unit-16-shallow-8-deep-4-jumbo-sunshine-yellow","title":"Gratnells Callero Custom Tall Flexi Store Starter Unit with 16 Shallow, 8 Deep \u0026 4 Jumbo Trays – Sunshine Yellow","description":"\u003cp\u003eThe Gratnells Callero Custom Tall Flexi Store Starter Unit provides high-capacity classroom storage in a compact footprint, making it ideal for STEM learning spaces where organization is essential. Featuring a combination of shallow, deep, and jumbo trays, it offers versatile storage for everything from small components to larger classroom resources while helping keep learning environments neat and accessible.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\u003cp\u003eDesigned for schools, makerspaces, libraries, and STEM labs, this modular storage system helps educators organize a wide variety of teaching materials without sacrificing valuable floor space. Its durable steel frame, smooth antimicrobial trays, and child-friendly safety features support everyday classroom use while allowing storage systems to expand as instructional needs grow.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eIncludes 16 shallow, 8 deep, and 4 jumbo trays for flexible storage capacity.\u003c\/li\u003e\n\u003cli\u003eCompact tall frame maximizes vertical storage while minimizing classroom footprint.\u003c\/li\u003e\n\u003cli\u003eStrong steel frame supports up to 250 kg for long-term institutional use.\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being pulled out too far, improving classroom safety.\u003c\/li\u003e\n\u003cli\u003eRounded frame design eliminates sharp edges for child-friendly environments.\u003c\/li\u003e\n\u003cli\u003eModular Callero system allows additional units to be added as storage needs increase.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eStore robotics kits, engineering materials, and STEM classroom supplies.\u003c\/li\u003e\n\u003cli\u003eOrganize science equipment, maker tools, and project components.\u003c\/li\u003e\n\u003cli\u003eCreate accessible resource stations for collaborative learning.\u003c\/li\u003e\n\u003cli\u003eSupport makerspaces, libraries, innovation labs, and technology classrooms.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48610660811001,"sku":"CSTA252144020202","price":3310.39,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CSTA252144020202_-_Callero_Custom_Tall_Flexi-Store_Starter_Unit_16_Shallow_8_Deep_4_Jumbo_Sunshine_Yellow.avif?v=1782806106"},{"product_id":"gratnells-callero-custom-low-level-4-deep-4-jumbo-tray-starter-unit-sunshine-yellow","title":"Gratnells Callero Custom Low Level 4 Deep \u0026 4 Jumbo Tray Starter Unit – Silver Frame with Sunshine Yellow Trays","description":"\u003cp\u003eThe Gratnells Callero Custom Low Level 4 Deep \u0026amp; 4 Jumbo Tray Starter Unit provides a flexible, space-efficient storage solution designed for modern classrooms, STEM labs, libraries, and makerspaces. Its low-profile frame makes supplies easily accessible while combining deep and jumbo trays to organize materials of different sizes in one convenient storage system.\u003c\/p\u003e\n\n\u003cp\u003eBuilt around the trusted Gratnells tray system, this modular storage unit helps educators create organized learning environments that support hands-on instruction, collaborative projects, and efficient classroom management. The durable steel frame and smooth-running trays are designed for everyday educational use.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eTeachers, STEM coordinators, and library staff rely on this storage unit to keep classroom materials organized without sacrificing valuable floor space. The combination of deep and jumbo trays makes it easy to separate everyday supplies from larger equipment while supporting student independence through safe, accessible storage.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eIncludes 4 deep trays and 4 jumbo trays for versatile classroom organization.\u003c\/li\u003e\n  \u003cli\u003eCompact low-level design fits beneath displays, windows, or work surfaces.\u003c\/li\u003e\n  \u003cli\u003eHeavy-duty steel frame supports up to 250 kg for long-term classroom use.\u003c\/li\u003e\n  \u003cli\u003eStopSafe runners help prevent trays from being pulled out too far for added safety.\u003c\/li\u003e\n  \u003cli\u003eCompatible with the modular Gratnells Callero Custom storage system for future expansion.\u003c\/li\u003e\n  \u003cli\u003eAntimicrobial polypropylene trays are durable, easy to clean, and ideal for busy learning environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eOrganize robotics, engineering, and STEM project materials.\u003c\/li\u003e\n  \u003cli\u003eStore science equipment, art supplies, and maker tools.\u003c\/li\u003e\n  \u003cli\u003eCreate accessible classroom resource stations for independent learning.\u003c\/li\u003e\n  \u003cli\u003eManage shared materials in libraries, innovation labs, and collaborative learning spaces.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48610674114809,"sku":"CSTA2544020202","price":1821.23,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CSTA2544020202_-_Callero_Custom_Low_Treble_Starter_Unit_4_Deep_4_Jumbo_Sunshine_Yellow_Trays.avif?v=1782806621"},{"product_id":"gratnells-callero-tall-maker-store-starter-unit-15-deep-12-shallow-trays-silver-sunshine-yellow","title":"Gratnells Callero Tall Maker Store Starter Unit with 15 Deep \u0026 12 Shallow Trays – Silver\/Sunshine Yellow","description":"\u003cp\u003eThe Gratnells Callero Tall Maker Store Starter Unit is a high-capacity classroom storage solution designed to organize STEM tools, maker supplies, robotics components, and everyday learning materials. Its slim footprint maximizes storage while preserving valuable classroom space, making it ideal for busy learning environments.\u003c\/p\u003e\n\n\u003cp\u003eFeaturing a durable steel frame with 15 deep and 12 shallow Gratnells trays, this modular storage unit helps educators keep resources organized, accessible, and ready for hands-on learning across a wide range of educational settings.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eSchools, makerspaces, libraries, and STEM labs rely on organized storage to support efficient classroom management and independent student access. The Callero system helps create flexible learning spaces where materials remain secure, easy to find, and ready for collaborative projects.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eIncludes 15 deep trays and 12 shallow trays for versatile classroom storage.\u003c\/li\u003e\n  \u003cli\u003eTall treble-width frame provides high-capacity storage with a compact footprint.\u003c\/li\u003e\n  \u003cli\u003eCompatible with the modular Callero Custom system for future expansion.\u003c\/li\u003e\n  \u003cli\u003eStopSafe runners help prevent trays from being pulled out too far for improved classroom safety.\u003c\/li\u003e\n  \u003cli\u003eHeavy-duty steel frame supports up to 250 kg of evenly distributed load.\u003c\/li\u003e\n  \u003cli\u003eDurable polypropylene trays resist daily classroom wear and are easy to clean.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eStore robotics, engineering, and maker project materials.\u003c\/li\u003e\n  \u003cli\u003eOrganize STEM consumables, classroom tools, and equipment.\u003c\/li\u003e\n  \u003cli\u003eCreate centralized resource stations in innovation labs and makerspaces.\u003c\/li\u003e\n  \u003cli\u003eSupport independent student access to learning materials.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48610697150713,"sku":"CSTA340744020202","price":3527.48,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CSTA340744020202_-_Callero_Custom_Tall_Maker-Store_Starter_Unit_12_Shallow_3_Deep_Tilting_12_Deep_Sunshine_Yellow_Trays.avif?v=1782807196"},{"product_id":"gratnells-callero-custom-tall-maker-store-starter-unit-royal-blue","title":"Gratnells Callero Custom Tall Maker Store Starter Unit – Royal Blue Trays","description":"\u003cp\u003eThe Gratnells Callero Custom Tall Maker Store Starter Unit is a high-capacity classroom storage solution designed to keep STEM learning spaces organized, accessible, and efficient. Featuring a durable silver steel frame with 15 deep and 12 shallow Royal Blue trays, it provides flexible storage for tools, robotics components, engineering materials, science equipment, and everyday classroom supplies.\u003c\/p\u003e\n\n\u003cp\u003eIts compact footprint maximizes storage while preserving valuable floor space, making it an excellent choice for classrooms, makerspaces, STEM labs, libraries, and innovation centers. Rounded frame edges and StopSafe runners help create a safer learning environment while encouraging independent student access to materials.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eTeachers and STEM coordinators rely on the Callero Custom system to simplify classroom organization and improve access to shared learning resources. The modular design supports evolving classroom layouts, making it easy to create organized storage systems that grow alongside STEM programs.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eIncludes 15 deep trays and 12 shallow Royal Blue Gratnells trays for flexible storage.\u003c\/li\u003e\n\u003cli\u003eTall treble-width steel frame provides high-capacity storage in a compact footprint.\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being accidentally removed.\u003c\/li\u003e\n\u003cli\u003eRounded frame design enhances safety in student learning environments.\u003c\/li\u003e\n\u003cli\u003eStrong steel construction supports up to 250 kg frame capacity.\u003c\/li\u003e\n\u003cli\u003eCompatible with the modular Callero Custom range for future expansion.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eOrganize robotics, engineering, and maker project supplies.\u003c\/li\u003e\n\u003cli\u003eStore science equipment and STEM lab resources.\u003c\/li\u003e\n\u003cli\u003eCreate accessible classroom resource centers and material stations.\u003c\/li\u003e\n\u003cli\u003eSupport makerspaces, libraries, innovation labs, and collaborative learning environments.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48610715369721,"sku":"CSTA340744060606","price":3527.48,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CSTA340744060606_-_Callero_Custom_Tall_Maker-Store_Starter_Unit_12_Shallow_3_Deep_Tilting_12_Deep_Royal_Blue_Trays.avif?v=1782807836"},{"product_id":"gratnells-callero-tall-maker-store-starter-unit-15-deep-12-shallow-light-gray","title":"Gratnells Callero Tall Maker Store Starter Unit with 15 Deep \u0026 12 Shallow Trays – Light Gray","description":"\u003cp\u003eThe Gratnells Callero Tall Maker Store Starter Unit provides high-capacity classroom storage in a compact footprint, making it ideal for STEM classrooms, makerspaces, innovation labs, and school libraries. Featuring 15 deep trays and 12 shallow trays in Light Gray, it helps educators organize a wide variety of teaching materials, tools, components, and student projects while keeping learning spaces tidy and accessible.\u003c\/p\u003e\n\n\u003cp\u003eDesigned for busy educational environments, the durable steel frame and Gratnells tray system support flexible classroom organization. The modular Callero system can be expanded as storage needs grow, giving schools a long-term solution that adapts to changing programs and learning spaces.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eThis storage unit supports efficient classroom management by keeping frequently used STEM resources organized and within easy reach. Its high-capacity design maximizes storage without taking up unnecessary floor space, while child-friendly safety features make it well suited for collaborative learning environments.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eIncludes 15 deep trays and 12 shallow trays in Light Gray for flexible storage.\u003c\/li\u003e\n\u003cli\u003eTall treble-width steel frame with a 250 kg frame load capacity.\u003c\/li\u003e\n\u003cli\u003eCompact 16.9-inch depth maximizes storage while conserving classroom space.\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being fully removed, improving classroom safety.\u003c\/li\u003e\n\u003cli\u003eModular Callero system can be expanded with additional frames and storage configurations.\u003c\/li\u003e\n\u003cli\u003eRounded frame design eliminates sharp edges for safer use around students.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eOrganize robotics, engineering, and maker supplies.\u003c\/li\u003e\n\u003cli\u003eStore STEM kits, science equipment, and classroom resources.\u003c\/li\u003e\n\u003cli\u003eCreate efficient storage for school libraries and resource centers.\u003c\/li\u003e\n\u003cli\u003eManage student materials for collaborative and project-based learning.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48610723004665,"sku":"CSTA340744191919","price":3527.48,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CSTA340744191919_-_Callero_Custom_Tall_Maker-Store_Starter_Unit_12_Shallow_3_Deep_Tilting_12_Deep_Light_Grey_Trays.avif?v=1782808593"},{"product_id":"gratnells-callero-tall-maker-store-starter-unit-15-deep-12-shallow-translucent","title":"Gratnells Callero Tall Maker Store Starter Unit with 15 Deep \u0026 12 Shallow Trays – Translucent","description":"\u003cp\u003eThe Gratnells Callero Tall Maker Store Starter Unit is a high-capacity classroom storage solution designed to organize STEM materials, maker tools, robotics components, and everyday learning resources. Featuring a durable steel frame and 27 translucent Gratnells trays, it helps educators create an efficient, easy-to-manage learning environment while maximizing valuable classroom space.\u003c\/p\u003e\n\n\u003cp\u003eIts slim footprint makes it ideal for classrooms, makerspaces, libraries, and innovation labs where storage capacity and accessibility are equally important. The translucent trays allow students and teachers to quickly identify contents, supporting independent learning and reducing time spent searching for materials.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eModern STEM classrooms require organized, flexible storage that keeps supplies accessible without occupying excessive floor space. The Callero Maker Store system supports project-based learning by providing dedicated storage for equipment, consumables, and classroom resources while promoting student independence through safe, easy-access trays.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eIncludes 15 deep and 12 shallow translucent Gratnells trays for versatile classroom organization.\u003c\/li\u003e\n  \u003cli\u003eTall treble-width steel frame provides high-density storage while maintaining a compact footprint.\u003c\/li\u003e\n  \u003cli\u003eTranslucent trays make it easy to identify contents without removing drawers.\u003c\/li\u003e\n  \u003cli\u003eStopSafe runners help prevent trays from being accidentally pulled out too far for added classroom safety.\u003c\/li\u003e\n  \u003cli\u003eSteel frame supports up to 250 kg with trays rated to hold up to 5 kg each.\u003c\/li\u003e\n  \u003cli\u003eModular Callero system can be expanded with additional compatible storage frames as classroom needs grow.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eOrganize robotics parts, engineering materials, and maker supplies.\u003c\/li\u003e\n  \u003cli\u003eStore STEM kits, electronics, and classroom tools by project or grade level.\u003c\/li\u003e\n  \u003cli\u003eCreate organized resource stations for collaborative learning spaces.\u003c\/li\u003e\n  \u003cli\u003eSupport makerspaces, school libraries, innovation labs, and technology classrooms.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48610730148089,"sku":"CSTA340744202020","price":3527.48,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CSTA340744191919_-_Callero_Custom_Tall_Maker-Store_Starter_Unit_12_Shallow_3_Deep_Tilting_12_Deep_Light_Grey_Trays_8bd9f2bf-2013-4fc6-9e72-89016fe1ba01.avif?v=1782809207"},{"product_id":"gratnells-callero-tall-maker-store-starter-unit-15-deep-12-shallow-cyan-blue","title":"Gratnells Callero Tall Maker Store Starter Unit with 15 Deep \u0026 12 Shallow Cyan Blue Trays","description":"\u003cp\u003eThe Gratnells Callero Tall Maker Store Starter Unit is a high-capacity classroom storage solution designed to keep STEM materials, maker supplies, and learning resources organized and easy to access. Featuring a durable steel frame with 15 deep and 12 shallow cyan blue trays, it helps educators maximize storage while maintaining a safe, organized learning environment.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\u003cp\u003eDesigned for schools, makerspaces, libraries, and innovation labs, this modular storage unit supports hands-on learning by keeping tools and materials neatly organized. Its compact footprint, expandable design, and child-friendly safety features make it ideal for busy STEM classrooms where efficient organization improves instructional time.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eIncludes 15 deep trays and 12 shallow cyan blue Gratnells trays for flexible storage.\u003c\/li\u003e\n  \u003cli\u003eHeavy-duty steel frame supports up to 250 kg of distributed load.\u003c\/li\u003e\n  \u003cli\u003eStopSafe runners help prevent trays from being fully removed, improving classroom safety.\u003c\/li\u003e\n  \u003cli\u003eCompact tall design provides high-density storage while minimizing floor space.\u003c\/li\u003e\n  \u003cli\u003eModular Callero system can be expanded with additional frames and shelving as classroom needs grow.\u003c\/li\u003e\n  \u003cli\u003eRounded frame design eliminates sharp edges for safer use in student learning spaces.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eOrganize robotics, engineering, and maker supplies.\u003c\/li\u003e\n  \u003cli\u003eStore STEM kits, electronics, and classroom manipulatives.\u003c\/li\u003e\n  \u003cli\u003eCreate organized resource stations in libraries and media centers.\u003c\/li\u003e\n  \u003cli\u003eSupport flexible classroom layouts with scalable storage solutions.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48610759704825,"sku":"CSTA340744262626","price":3527.48,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CSTA340744262626_-_Callero_Custom_Tall_Maker-Store_Starter_Unit_12_Shallow_3_Deep_Tilting_12_Deep_Cyan_Blue_Trays.avif?v=1782809847"},{"product_id":"gratnells-callero-tall-maker-store-starter-unit-15-deep-12-shallow-kiwi-translucent-trays","title":"Gratnells Callero Tall Maker Store Starter Unit with 15 Deep \u0026 12 Shallow Kiwi Translucent Trays","description":"\u003cp\u003eThe Gratnells Callero Tall Maker Store Starter Unit provides high-capacity, space-efficient storage for STEM classrooms, makerspaces, libraries, and innovation labs. Featuring 15 deep and 12 shallow Kiwi Translucent trays, this tall storage system helps educators keep learning materials organized, accessible, and ready for daily classroom use.\u003c\/p\u003e\n\n\u003cp\u003eBuilt around the trusted Gratnells tray system, the durable steel frame offers exceptional storage capacity while maintaining a compact footprint. StopSafe runners improve classroom safety by limiting tray travel, helping students independently access materials with confidence.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eDesigned for modern learning environments, this storage unit supports hands-on STEM instruction by organizing robotics components, engineering supplies, science equipment, craft materials, and classroom resources. Its modular design allows schools to expand storage as programs grow while maintaining a clean, organized learning space.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eIncludes 15 deep and 12 shallow Kiwi Translucent Gratnells trays for flexible classroom organization.\u003c\/li\u003e\n\u003cli\u003eTall treble-width steel frame maximizes storage while using minimal floor space.\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being fully removed, improving classroom safety.\u003c\/li\u003e\n\u003cli\u003e250 kg frame load capacity with trays rated to hold up to 5 kg each.\u003c\/li\u003e\n\u003cli\u003eModular Callero system can be expanded with additional compatible storage frames.\u003c\/li\u003e\n\u003cli\u003eRounded frame design eliminates sharp edges for safer student environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eStore robotics, coding, and engineering project materials.\u003c\/li\u003e\n\u003cli\u003eOrganize science lab equipment and STEM consumables.\u003c\/li\u003e\n\u003cli\u003eCreate accessible makerspace supply stations.\u003c\/li\u003e\n\u003cli\u003eManage classroom resources for collaborative learning activities.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48610777792761,"sku":"CSTA340744292929","price":3527.48,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CSTA340744292929_-_Callero_Custom_Tall_Maker-Store_Starter_Unit_12_Shallow_3_Deep_Tilting_12_Deep_Kiwi_Green_Trays.avif?v=1782810378"},{"product_id":"gratnells-callero-tall-maker-store-starter-unit-jolly-lime-15-deep-12-shallow","title":"Gratnells Callero Tall Maker Store Starter Unit – Silver Frame with 15 Deep \u0026 12 Shallow Jolly Lime Trays","description":"\u003cp\u003eThe Gratnells Callero Tall Maker Store Starter Unit provides high-capacity classroom storage designed to keep STEM materials organized, accessible, and ready for learning. Featuring a durable silver steel frame with 15 deep and 12 shallow Jolly Lime trays, it helps educators efficiently store everything from robotics components to science supplies while maximizing valuable classroom space.\u003c\/p\u003e\n\n\u003cp\u003eIts tall, compact footprint makes it ideal for makerspaces, STEM labs, classrooms, libraries, and innovation centers where organized storage supports active, hands-on learning every day.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eDesigned for busy educational environments, this modular storage unit helps schools create flexible learning spaces that keep equipment organized, reduce classroom clutter, and encourage student independence. The combination of shallow and deep trays allows educators to separate small components from larger classroom resources, making STEM activities easier to prepare and manage.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eIncludes 15 deep trays and 12 shallow Jolly Lime trays for versatile storage.\u003c\/li\u003e\n  \u003cli\u003eHeavy-duty silver steel frame supports up to 250 kg of distributed load.\u003c\/li\u003e\n  \u003cli\u003eCompact 16.9-inch depth maximizes storage while conserving classroom floor space.\u003c\/li\u003e\n  \u003cli\u003eStopSafe runners help prevent trays from being accidentally removed.\u003c\/li\u003e\n  \u003cli\u003eRounded frame design enhances safety in student learning environments.\u003c\/li\u003e\n  \u003cli\u003eModular Callero system can be expanded with additional compatible frames.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eOrganize robotics, engineering, and maker supplies.\u003c\/li\u003e\n  \u003cli\u003eStore science lab equipment and classroom resources.\u003c\/li\u003e\n  \u003cli\u003eCreate flexible storage walls for STEM labs and makerspaces.\u003c\/li\u003e\n  \u003cli\u003eSupport independent student access to learning materials.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48610793718009,"sku":"CSTA340744363636","price":3527.48,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CSTA340744363636_-_Callero_Custom_Tall_Maker-Store_Starter_Unit_12_Shallow_3_Deep_Tilting_12_Deep_Jolly_Lime_Trays.avif?v=1782810939"},{"product_id":"gratnells-callero-tall-maker-starter-unit-28-shallow-7-deep-sunshine-yellow-trays","title":"Gratnells Callero Tall Maker Starter Unit with 28 Shallow \u0026 7 Deep Sunshine Yellow Trays","description":"\u003cp\u003eThe Gratnells Callero Tall Maker Starter Unit provides high-capacity classroom storage designed for busy STEM learning environments. Featuring 28 shallow trays and 7 deep trays in Sunshine Yellow, this tall storage system helps teachers organize tools, components, project materials, and classroom resources while maximizing valuable floor space.\u003c\/p\u003e\n\n\u003cp\u003eBuilt with a durable steel frame and the trusted Gratnells tray system, this modular storage solution supports organized, student-friendly learning spaces. Its slim footprint, smooth edges, and StopSafe runners make it well suited for classrooms, makerspaces, STEM labs, libraries, and innovation centers.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eEffective STEM instruction depends on organized access to materials. The Callero Tall Maker Starter Unit keeps supplies neatly sorted, easy to locate, and readily available, helping teachers reduce setup time while encouraging students to independently access and return classroom resources.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eIncludes 28 shallow trays and 7 deep Sunshine Yellow Gratnells trays for flexible storage.\u003c\/li\u003e\n\u003cli\u003eTall treble-width steel frame provides high-capacity storage in a compact footprint.\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being accidentally removed.\u003c\/li\u003e\n\u003cli\u003eSmooth, rounded frame design enhances safety in student learning environments.\u003c\/li\u003e\n\u003cli\u003eSupports up to 250 kg total frame load with trays rated for up to 5 kg each.\u003c\/li\u003e\n\u003cli\u003eModular Callero system can be expanded as storage needs grow.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eStore robotics components, engineering materials, and STEM project supplies.\u003c\/li\u003e\n\u003cli\u003eOrganize maker tools, electronics, and classroom consumables.\u003c\/li\u003e\n\u003cli\u003eCreate efficient resource storage for science labs and innovation spaces.\u003c\/li\u003e\n\u003cli\u003eSupport independent student access during hands-on learning activities.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48610807546105,"sku":"CSTA342144020202","price":3466.6,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CSTA342144020202_-_Callero_Custom_Tall_Maker-Tall_Starter_Unit_28_Shallow_3_Deep_Tilting_4_Deep_Sunshine_Yellow_Trays.avif?v=1782811413"},{"product_id":"gratnells-callero-tall-maker-starter-storage-unit-28-shallow-7-deep-royal-blue","title":"Gratnells Callero Tall Maker Starter Storage Unit with 28 Shallow \u0026 7 Deep Royal Blue Trays","description":"\u003cp\u003eThe Gratnells Callero Tall Maker Starter Unit is a high-capacity classroom storage solution designed to keep STEM learning spaces organized, efficient, and ready for hands-on instruction. Featuring a durable silver steel frame with 28 shallow and 7 deep Royal Blue trays, it provides flexible storage for tools, robotics components, maker supplies, science materials, and classroom resources while maximizing floor space.\u003c\/p\u003e\n\n\u003cp\u003eDesigned specifically for educational environments, the modular Callero system helps schools create organized learning spaces that can expand as classroom needs evolve. Its slim footprint, child-friendly design, and secure tray runners make it ideal for busy classrooms, makerspaces, libraries, and innovation labs.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eTeachers and STEM coordinators rely on the Callero system to simplify classroom organization while keeping frequently used materials accessible. The combination of shallow and deep trays supports a wide variety of supplies, helping students work more independently while maintaining an orderly learning environment.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eIncludes 28 shallow trays and 7 deep Royal Blue trays for flexible supply organization.\u003c\/li\u003e\n  \u003cli\u003eHeavy-duty steel frame supports up to 250 kg of distributed load.\u003c\/li\u003e\n  \u003cli\u003eCompact 16.9-inch depth maximizes storage without sacrificing valuable classroom space.\u003c\/li\u003e\n  \u003cli\u003eStopSafe runners help prevent trays from being pulled out too far for added classroom safety.\u003c\/li\u003e\n  \u003cli\u003eModular Callero design can be expanded with additional compatible frames.\u003c\/li\u003e\n  \u003cli\u003eIdeal for storing STEM equipment, maker materials, science supplies, and classroom resources.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eOrganize robotics, engineering, and maker project materials.\u003c\/li\u003e\n  \u003cli\u003eStore science lab equipment and consumable classroom supplies.\u003c\/li\u003e\n  \u003cli\u003eCreate efficient resource stations in STEM labs and makerspaces.\u003c\/li\u003e\n  \u003cli\u003eSupport libraries, innovation hubs, and collaborative learning environments.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48610851684601,"sku":"CSTA342144060606","price":3466.6,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CSTA342144060606_-_Callero_Custom_Tall_Maker-Tall_Starter_Unit_28_Shallow_3_Deep_Tilting_4_Deep_Royal_Blue_Trays.avif?v=1782812364"},{"product_id":"gratnells-callero-tall-maker-starter-unit-28-shallow-7-deep-flame-red-trays","title":"Gratnells Callero Tall Maker Starter Unit with 28 Shallow \u0026 7 Deep Flame Red Trays","description":"\u003cp\u003eThe Gratnells Callero Tall Maker Starter Unit is a high-capacity classroom storage solution designed to keep STEM resources, maker materials, tools, and learning supplies organized and easy to access. Featuring 28 shallow trays and 7 deep trays in a durable silver steel frame, it helps educators maximize storage while maintaining a clean, efficient learning environment. Its compact footprint makes it ideal for classrooms, makerspaces, libraries, and innovation labs where space and organization are equally important.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eSTEM classrooms require storage that supports hands-on learning without creating clutter. The modular Callero system allows schools to organize equipment, consumables, robotics components, engineering materials, and classroom resources in one accessible location while promoting student independence and safer classroom workflows.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eIncludes 28 shallow trays and 7 deep Flame Red trays for flexible classroom organization.\u003c\/li\u003e\n  \u003cli\u003eCompact tall frame maximizes vertical storage while minimizing floor space.\u003c\/li\u003e\n  \u003cli\u003eHeavy-duty steel frame supports up to 250 kg for demanding educational environments.\u003c\/li\u003e\n  \u003cli\u003eStopSafe runners help prevent trays from being accidentally removed, improving classroom safety.\u003c\/li\u003e\n  \u003cli\u003eDurable polypropylene trays are easy to clean and designed for daily school use.\u003c\/li\u003e\n  \u003cli\u003eModular Callero system can be expanded with additional frames to create custom storage layouts.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eOrganize robotics kits, engineering tools, and STEM supplies.\u003c\/li\u003e\n  \u003cli\u003eStore maker materials for design, fabrication, and prototyping activities.\u003c\/li\u003e\n  \u003cli\u003eCreate centralized classroom resource stations for student access.\u003c\/li\u003e\n  \u003cli\u003eSupport makerspaces, libraries, innovation labs, and collaborative learning environments.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48611020439801,"sku":"CSTA342144090909","price":3466.6,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CSTA342144090909_-_Callero_Custom_Tall_Maker-Tall_Starter_Unit_28_Shallow_3_Deep_Tilting_4_Deep_Flame_Red_Trays.avif?v=1782812965"},{"product_id":"gratnells-callero-tall-maker-starter-unit-28-shallow-7-deep-light-gray-trays","title":"Gratnells Callero Tall Maker Starter Unit with 28 Shallow \u0026 7 Deep Light Gray Trays","description":"\u003cp\u003eThe Gratnells Callero Tall Maker Starter Unit is a high-capacity classroom storage solution designed to keep STEM, maker, and educational resources organized and easily accessible. Featuring a durable steel frame with 28 shallow and 7 deep light gray trays, it helps educators maximize storage while maintaining a clean, efficient learning environment. Its compact footprint makes it ideal for classrooms, makerspaces, libraries, and innovation labs where space is at a premium.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Educators Use It\u003c\/h3\u003e\n\n\u003cp\u003eFlexible storage is essential in active learning spaces. The modular Callero system allows schools to organize everything from robotics components and engineering supplies to science materials and classroom resources while supporting student independence through safe, easy-access tray storage. Its expandable design also allows storage systems to grow alongside changing classroom needs.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eIncludes 28 shallow and 7 deep light gray trays for high-capacity classroom organization.\u003c\/li\u003e\n\u003cli\u003eHeavy-duty steel frame supports up to 250 kg while maintaining a compact footprint.\u003c\/li\u003e\n\u003cli\u003eStopSafe runners help prevent trays from being accidentally removed, improving classroom safety.\u003c\/li\u003e\n\u003cli\u003eSmooth, rounded frame design minimizes sharp edges for child-friendly learning environments.\u003c\/li\u003e\n\u003cli\u003eModular Callero system can be expanded with additional frames and storage configurations.\u003c\/li\u003e\n\u003cli\u003eIdeal for organizing STEM equipment, maker materials, science supplies, art resources, and classroom tools.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eClassroom Applications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eOrganize robotics kits, coding devices, and engineering materials.\u003c\/li\u003e\n\u003cli\u003eStore science lab equipment and classroom consumables.\u003c\/li\u003e\n\u003cli\u003eCreate efficient maker and innovation space storage systems.\u003c\/li\u003e\n\u003cli\u003eSupport library, media center, and resource room organization.\u003c\/li\u003e\n\u003cli\u003eKeep shared classroom supplies accessible for independent student use.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRATNELLS","offers":[{"title":"Default Title","offer_id":48611113435385,"sku":"CSTA342144191919","price":3466.6,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/0692\/0953\/files\/CSTA342144191919_-_Callero_Custom_Tall_Maker-Tall_Starter_Unit_28_Shallow_3_Deep_Tilting_4_Deep_Light_Grey_Trays.avif?v=1782813870"}],"url":"https:\/\/stemclassrooms.com\/collections\/storage-organization.oembed?page=4","provider":"STEMclassrooms.com","version":"1.0","type":"link"}